| Base | Representation |
|---|---|
| bin | 10001110010010001011… |
| … | …001100110111000000100 |
| 3 | 11022211201220222011120200 |
| 4 | 101302101121212320010 |
| 5 | 130011041242334340 |
| 6 | 2333250420330500 |
| 7 | 154205335422024 |
| oct | 21622131467004 |
| 9 | 4284656864520 |
| 10 | 1222210121220 |
| 11 | 431377828980 |
| 12 | 178a57843a30 |
| 13 | 8b33bb28a7a |
| 14 | 43226163a84 |
| 15 | 21bd49c2330 |
| hex | 11c91666e04 |
1222210121220 has 144 divisors (see below), whose sum is σ = 4057580374848. Its totient is φ = 295328090880.
The previous prime is 1222210121183. The next prime is 1222210121263. The reversal of 1222210121220 is 221210122221.
It is a happy number.
1222210121220 is a `hidden beast` number, since 1 + 222 + 210 + 1 + 212 + 20 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a junction number, because it is equal to n+sod(n) for n = 1222210121193 and 1222210121202.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 397479 + ... + 1613198.
It is an arithmetic number, because the mean of its divisors is an integer number (28177641492).
Almost surely, 21222210121220 is an apocalyptic number.
1222210121220 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 1222210121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2028790187424).
1222210121220 is an abundant number, since it is smaller than the sum of its proper divisors (2835370253628).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1222210121220 is a wasteful number, since it uses less digits than its factorization.
1222210121220 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2011010 (or 2011005 counting only the distinct ones).
The product of its (nonzero) digits is 128, while the sum is 18.
Adding to 1222210121220 its reverse (221210122221), we get a palindrome (1443420243441).
The spelling of 1222210121220 in words is "one trillion, two hundred twenty-two billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty".
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