251604215212 has 12 divisors (see below), whose sum is σ = 503208430480. Its totient is φ = 107830377936.

The previous prime is 251604215207. The next prime is 251604215227. The reversal of 251604215212 is 212512406152.

251604215212 is an admirable number.

It is a super-2 number, since 2×251604215212² (a number of 24 digits) contains 22 as substring.

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, 4492932387 + ... + 4492932442.

Almost surely, 2^251604215212 is an apocalyptic number.

It is an amenable number.

251604215212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

251604215212 is a wasteful number, since it uses less digits than its factorization.

251604215212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8985864840 (or 8985864838 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The spelling of 251604215212 in words is "two hundred fifty-one billion, six hundred four million, two hundred fifteen thousand, two hundred twelve".