212897804520 has 64 divisors (see below), whose sum is σ = 638793267840. Its totient is φ = 56763872000.

The previous prime is 212897804491. The next prime is 212897804699. The reversal of 212897804520 is 25408798212.

It is a super-2 number, since 2×212897804520² (a number of 23 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 212897804520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650710 + ... + 921530.

It is an arithmetic number, because the mean of its divisors is an integer number (9981144810).

Almost surely, 2^212897804520 is an apocalyptic number.

212897804520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212897804520 is an abundant number, since it is smaller than the sum of its proper divisors (425895463320).

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

212897804520 is a wasteful number, since it uses less digits than its factorization.

212897804520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277386 (or 277382 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 212897804520 in words is "two hundred twelve billion, eight hundred ninety-seven million, eight hundred four thousand, five hundred twenty".