21111230013020 has 96 divisors (see below), whose sum is σ = 52005000499200. Its totient is φ = 7048534014720.

The previous prime is 21111230012989. The next prime is 21111230013031. The reversal of 21111230013020 is 2031003211112.

It is a self number, because there is not a number n which added to its sum of digits gives 21111230013020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6751871 + ... + 9370710.

It is an arithmetic number, because the mean of its divisors is an integer number (541718755200).

Almost surely, 2^{21111230013020} is an apocalyptic number.

21111230013020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111230013020 is an abundant number, since it is smaller than the sum of its proper divisors (30893770486180).

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

21111230013020 is a wasteful number, since it uses less digits than its factorization.

21111230013020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16122843 (or 16122841 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21111230013020 its reverse (2031003211112), we get a palindrome (23142233224132).

The spelling of 21111230013020 in words is "twenty-one trillion, one hundred eleven billion, two hundred thirty million, thirteen thousand, twenty".