31215250212 has 24 divisors (see below), whose sum is σ = 72943827936. Its totient is φ = 10389619968.

The previous prime is 31215250211. The next prime is 31215250217. The reversal of 31215250212 is 21205251213.

It is not an unprimeable number, because it can be changed into a prime (31215250211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924518 + ... + 1940669.

It is an arithmetic number, because the mean of its divisors is an integer number (3039326164).

Almost surely, 2^31215250212 is an apocalyptic number.

It is an amenable number.

31215250212 is an abundant number, since it is smaller than the sum of its proper divisors (41728577724).

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

31215250212 is a wasteful number, since it uses less digits than its factorization.

31215250212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3865867 (or 3865865 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The spelling of 31215250212 in words is "thirty-one billion, two hundred fifteen million, two hundred fifty thousand, two hundred twelve".