21221121010120 has 32 divisors (see below), whose sum is σ = 48912095990520. Its totient is φ = 8281413076480.

The previous prime is 21221121010097. The next prime is 21221121010189. The reversal of 21221121010120 is 2101012112212.

It can be written as a sum of positive squares in 4 ways, for example, as 12427274754756 + 8793846255364 = 3525234^2 + 2965442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21221121010094 and 21221121010103.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6469852327 + ... + 6469855606.

Almost surely, 2^{21221121010120} is an apocalyptic number.

21221121010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221121010120 is an abundant number, since it is smaller than the sum of its proper divisors (27690974980400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221121010120 is a wasteful number, since it uses less digits than its factorization.

21221121010120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12939707985 (or 12939707981 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21221121010120 its reverse (2101012112212), we get a palindrome (23322133122332).

The spelling of 21221121010120 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty-one million, ten thousand, one hundred twenty".