21031113012 has 72 divisors (see below), whose sum is σ = 61475583456. Its totient is φ = 5546665152.

The previous prime is 21031113007. The next prime is 21031113023.

It is a happy number.

21031113012 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 21031112982 and 21031113000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1368018 + ... + 1383305.

It is an arithmetic number, because the mean of its divisors is an integer number (853827548).

Almost surely, 2^21031113012 is an apocalyptic number.

It is an amenable number.

21031113012 is an abundant number, since it is smaller than the sum of its proper divisors (40444470444).

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

21031113012 is a wasteful number, since it uses less digits than its factorization.

21031113012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2751357 (or 2751348 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

The spelling of 21031113012 in words is "twenty-one billion, thirty-one million, one hundred thirteen thousand, twelve".