21002120102120 has 64 divisors (see below), whose sum is σ = 47279364249600. Its totient is φ = 8396476784640.

The previous prime is 21002120102101. The next prime is 21002120102141. The reversal of 21002120102120 is 2120102120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002120102095 and 21002120102104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143461177 + ... + 1143479543.

It is an arithmetic number, because the mean of its divisors is an integer number (738740066400).

Almost surely, 2^{21002120102120} is an apocalyptic number.

21002120102120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002120102120 is an abundant number, since it is smaller than the sum of its proper divisors (26277244147480).

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

21002120102120 is a wasteful number, since it uses less digits than its factorization.

21002120102120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31698 (or 31694 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002120102120 its reverse (2120102120012), we get a palindrome (23122222222132).

The spelling of 21002120102120 in words is "twenty-one trillion, two billion, one hundred twenty million, one hundred two thousand, one hundred twenty".