21012012122120 has 64 divisors (see below), whose sum is σ = 50168695248000. Its totient is φ = 7903117877248.

The previous prime is 21012012122117. The next prime is 21012012122141. The reversal of 21012012122120 is 2122121021012.

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, 193497785 + ... + 193606344.

It is an arithmetic number, because the mean of its divisors is an integer number (783885863250).

Almost surely, 2^{21012012122120} is an apocalyptic number.

21012012122120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012012122120 is an abundant number, since it is smaller than the sum of its proper divisors (29156683125880).

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

21012012122120 is a wasteful number, since it uses less digits than its factorization.

21012012122120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387104222 (or 387104218 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012012122120 its reverse (2122121021012), we get a palindrome (23134133143132).

The spelling of 21012012122120 in words is "twenty-one trillion, twelve billion, twelve million, one hundred twenty-two thousand, one hundred twenty".