21031113331992 has 64 divisors (see below), whose sum is σ = 53308601343360. Its totient is φ = 6912966816000.

The previous prime is 21031113331973. The next prime is 21031113331997. The reversal of 21031113331992 is 29913331113012.

It is a self number, because there is not a number n which added to its sum of digits gives 21031113331992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031113331997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7661067 + ... + 10037637.

It is an arithmetic number, because the mean of its divisors is an integer number (832946895990).

Almost surely, 2^{21031113331992} is an apocalyptic number.

It is an amenable number.

21031113331992 is an abundant number, since it is smaller than the sum of its proper divisors (32277488011368).

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

21031113331992 is a wasteful number, since it uses less digits than its factorization.

21031113331992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2381704 (or 2381700 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 39.

The spelling of 21031113331992 in words is "twenty-one trillion, thirty-one billion, one hundred thirteen million, three hundred thirty-one thousand, nine hundred ninety-two".