21013431012 has 72 divisors (see below), whose sum is σ = 60756888192. Its totient is φ = 5998752000.

The previous prime is 21013430993. The next prime is 21013431031.

21013431012 is a `hidden beast` number, since 210 + 13 + 431 + 0 + 12 = 666.

21013431012 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21013430993) and next prime (21013431031).

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 267937 + ... + 337367.

Almost surely, 2^21013431012 is an apocalyptic number.

It is an amenable number.

21013431012 is an abundant number, since it is smaller than the sum of its proper divisors (39743457180).

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

21013431012 is a wasteful number, since it uses less digits than its factorization.

21013431012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70649 (or 70644 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The spelling of 21013431012 in words is "twenty-one billion, thirteen million, four hundred thirty-one thousand, twelve".