| Base | Representation |
|---|---|
| bin | 10001110001010101010… |
| … | …011111110100000101000 |
| 3 | 11022202010200000220222120 |
| 4 | 101301111103332200220 |
| 5 | 130002010203342300 |
| 6 | 2333002405151240 |
| 7 | 154141344555462 |
| oct | 21612523764050 |
| 9 | 4282120026876 |
| 10 | 1221202012200 |
| 11 | 4309aa776725 |
| 12 | 1788160bb520 |
| 13 | 8b20b00c961 |
| 14 | 4316c305132 |
| 15 | 21b7623d3a0 |
| hex | 11c554fe828 |
1221202012200 has 192 divisors, whose sum is σ = 3859104072960. Its totient is φ = 319348024320.
The previous prime is 1221202012159. The next prime is 1221202012241. The reversal of 1221202012200 is 22102021221.
It is an interprime number because it is at equal distance from previous prime (1221202012159) and next prime (1221202012241).
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 1221202012200.
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 47 ways as a sum of consecutive naturals, for example, 71128017 + ... + 71145183.
It is an arithmetic number, because the mean of its divisors is an integer number (20099500380).
Almost surely, 21221202012200 is an apocalyptic number.
1221202012200 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 1221202012200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1929552036480).
1221202012200 is an abundant number, since it is smaller than the sum of its proper divisors (2637902060760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1221202012200 is a wasteful number, since it uses less digits than its factorization.
1221202012200 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19476 (or 19467 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 15.
Adding to 1221202012200 its reverse (22102021221), we get a palindrome (1243304033421).
The spelling of 1221202012200 in words is "one trillion, two hundred twenty-one billion, two hundred two million, twelve thousand, two hundred".
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