21102220102120 has 32 divisors (see below), whose sum is σ = 47537269122600. Its totient is φ = 8430706015488.

The previous prime is 21102220102109. The next prime is 21102220102153. The reversal of 21102220102120 is 2120102220112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18311843626756 + 2790376475364 = 4279234^2 + 1670442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21102220102094 and 21102220102103.

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, 318154719 + ... + 318221038.

Almost surely, 2^{21102220102120} is an apocalyptic number.

21102220102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102220102120 is an abundant number, since it is smaller than the sum of its proper divisors (26435049020480).

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

21102220102120 is a wasteful number, since it uses less digits than its factorization.

21102220102120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636376597 (or 636376593 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21102220102120 its reverse (2120102220112), we get a palindrome (23222322322232).

The spelling of 21102220102120 in words is "twenty-one trillion, one hundred two billion, two hundred twenty million, one hundred two thousand, one hundred twenty".