31211440424 has 16 divisors (see below), whose sum is σ = 58526488500. Its totient is φ = 15604376832.

The previous prime is 31211440399. The next prime is 31211440471. The reversal of 31211440424 is 42404411213.

It can be written as a sum of positive squares in 2 ways, for example, as 24580595524 + 6630844900 = 156782^2 + 81430^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31211440393 and 31211440402.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65507 + ... + 258290.

Almost surely, 2^31211440424 is an apocalyptic number.

It is an amenable number.

31211440424 is a deficient number, since it is larger than the sum of its proper divisors (27315048076).

31211440424 is a wasteful number, since it uses less digits than its factorization.

31211440424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335852 (or 335848 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 31211440424 its reverse (42404411213), we get a palindrome (73615851637).

The spelling of 31211440424 in words is "thirty-one billion, two hundred eleven million, four hundred forty thousand, four hundred twenty-four".