31521428430940 has 96 divisors (see below), whose sum is σ = 77464894187520. Its totient is φ = 10549493789184.

The previous prime is 31521428430913. The next prime is 31521428430959. The reversal of 31521428430940 is 4903482412513.

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, 3826089 + ... + 8813728.

It is an arithmetic number, because the mean of its divisors is an integer number (806925981120).

Almost surely, 2^{31521428430940} is an apocalyptic number.

It is an amenable number.

31521428430940 is an abundant number, since it is smaller than the sum of its proper divisors (45943465756580).

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

31521428430940 is a wasteful number, since it uses less digits than its factorization.

31521428430940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12640259 (or 12640257 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 31521428430940 in words is "thirty-one trillion, five hundred twenty-one billion, four hundred twenty-eight million, four hundred thirty thousand, nine hundred forty".