| Base | Representation |
|---|---|
| bin | 10001110001010101111… |
| … | …010100010110001011000 |
| 3 | 11022202011101001120022000 |
| 4 | 101301111322202301120 |
| 5 | 130002020300402300 |
| 6 | 2333003410001000 |
| 7 | 154141526523630 |
| oct | 21612572426130 |
| 9 | 4282141046260 |
| 10 | 1221212122200 |
| 11 | 430a054514a4 |
| 12 | 178819576160 |
| 13 | 8b21013c5c5 |
| 14 | 4316d7b76c0 |
| 15 | 21b77088c00 |
| hex | 11c55ea2c58 |
1221212122200 has 768 divisors, whose sum is σ = 4895686656000. Its totient is φ = 274032253440.
The previous prime is 1221212122189. The next prime is 1221212122211. The reversal of 1221212122200 is 22212121221.
It is a happy number.
1221212122200 is a `hidden beast` number, since 1 + 221 + 212 + 12 + 220 + 0 = 666.
It is an interprime number because it is at equal distance from previous prime (1221212122189) and next prime (1221212122211).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 969985171 + ... + 969986429.
It is an arithmetic number, because the mean of its divisors is an integer number (6374592000).
Almost surely, 21221212122200 is an apocalyptic number.
1221212122200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1221212122200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2447843328000).
1221212122200 is an abundant number, since it is smaller than the sum of its proper divisors (3674474533800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221212122200 is a wasteful number, since it uses less digits than its factorization.
1221212122200 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1741 (or 1726 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 18.
Adding to 1221212122200 its reverse (22212121221), we get a palindrome (1243424243421).
The spelling of 1221212122200 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty-two thousand, two hundred".
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