212513815872 has 42 divisors (see below), whose sum is σ = 609132484298. Its totient is φ = 70837938432.

The previous prime is 212513815861. The next prime is 212513815907. The reversal of 212513815872 is 278518315212.

212513815872 is a `hidden beast` number, since 2 + 1 + 2 + 513 + 81 + 58 + 7 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 191087882496 + 21425933376 = 437136^2 + 146376^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184473223 + ... + 184474374.

Almost surely, 2^212513815872 is an apocalyptic number.

It is an amenable number.

212513815872 is an abundant number, since it is smaller than the sum of its proper divisors (396618668426).

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

212513815872 is a wasteful number, since it uses less digits than its factorization.

212513815872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368947615 (or 368947602 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The spelling of 212513815872 in words is "two hundred twelve billion, five hundred thirteen million, eight hundred fifteen thousand, eight hundred seventy-two".