31603274921 has 16 divisors (see below), whose sum is σ = 33360374400. Its totient is φ = 29855692800.

The previous prime is 31603274897. The next prime is 31603274933. The reversal of 31603274921 is 12947230613.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31603274921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31603274951) 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, 16818260 + ... + 16820138.

It is an arithmetic number, because the mean of its divisors is an integer number (2085023400).

Almost surely, 2^31603274921 is an apocalyptic number.

It is an amenable number.

31603274921 is a deficient number, since it is larger than the sum of its proper divisors (1757099479).

31603274921 is a wasteful number, since it uses less digits than its factorization.

31603274921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920.

The product of its (nonzero) digits is 54432, while the sum is 38.

The spelling of 31603274921 in words is "thirty-one billion, six hundred three million, two hundred seventy-four thousand, nine hundred twenty-one".