31894448421 has 48 divisors (see below), whose sum is σ = 47392188480. Its totient is φ = 18918831360.

The previous prime is 31894448419. The next prime is 31894448447. The reversal of 31894448421 is 12484449813.

It is not a de Polignac number, because 31894448421 - 2¹ = 31894448419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31894448321) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121271536 + ... + 121271798.

It is an arithmetic number, because the mean of its divisors is an integer number (987337260).

Almost surely, 2^31894448421 is an apocalyptic number.

It is an amenable number.

31894448421 is a deficient number, since it is larger than the sum of its proper divisors (15497740059).

31894448421 is a wasteful number, since it uses less digits than its factorization.

31894448421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786 (or 523 counting only the distinct ones).

The product of its digits is 884736, while the sum is 48.

The spelling of 31894448421 in words is "thirty-one billion, eight hundred ninety-four million, four hundred forty-eight thousand, four hundred twenty-one".