31216421264 has 20 divisors (see below), whose sum is σ = 69122075904. Its totient is φ = 13378466208.

The previous prime is 31216421231. The next prime is 31216421273. The reversal of 31216421264 is 46212461213.

It is a super-2 number, since 2×31216421264² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31216421264.

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, 139358912 + ... + 139359135.

Almost surely, 2^31216421264 is an apocalyptic number.

It is an amenable number.

31216421264 is an abundant number, since it is smaller than the sum of its proper divisors (37905654640).

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

31216421264 is a wasteful number, since it uses less digits than its factorization.

31216421264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278718062 (or 278718056 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

Adding to 31216421264 its reverse (46212461213), we get a palindrome (77428882477).

The spelling of 31216421264 in words is "thirty-one billion, two hundred sixteen million, four hundred twenty-one thousand, two hundred sixty-four".