31211012 has 48 divisors (see below), whose sum is σ = 64339968. Its totient is φ = 12972960.

The previous prime is 31211009. The next prime is 31211039. The reversal of 31211012 is 21011213.

It is a junction number, because it is equal to n+sod(n) for n = 31210984 and 31211002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238187 + ... + 238317.

It is an arithmetic number, because the mean of its divisors is an integer number (1340416).

Almost surely, 2^31211012 is an apocalyptic number.

It is an amenable number.

31211012 is an abundant number, since it is smaller than the sum of its proper divisors (33128956).

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

31211012 is a wasteful number, since it uses less digits than its factorization.

31211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 31211012 is about 5586.6816626688. The cubic root of 31211012 is about 314.8492164885.

Adding to 31211012 its reverse (21011213), we get a palindrome (52222225).

The spelling of 31211012 in words is "thirty-one million, two hundred eleven thousand, twelve".