21120011020120 has 32 divisors (see below), whose sum is σ = 47529222091200. Its totient is φ = 8446369333248.

The previous prime is 21120011020081. The next prime is 21120011020127. The reversal of 21120011020120 is 2102011002112.

It is a self number, because there is not a number n which added to its sum of digits gives 21120011020120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120011020127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50886825 + ... + 51300184.

It is an arithmetic number, because the mean of its divisors is an integer number (1485288190350).

Almost surely, 2^{21120011020120} is an apocalyptic number.

21120011020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120011020120 is an abundant number, since it is smaller than the sum of its proper divisors (26409211071080).

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

21120011020120 is a wasteful number, since it uses less digits than its factorization.

21120011020120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102192187 (or 102192183 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21120011020120 its reverse (2102011002112), we get a palindrome (23222022022232).

The spelling of 21120011020120 in words is "twenty-one trillion, one hundred twenty billion, eleven million, twenty thousand, one hundred twenty".