212685437550 has 24 divisors (see below), whose sum is σ = 527459885496. Its totient is φ = 56716116640.

The previous prime is 212685437527. The next prime is 212685437561. The reversal of 212685437550 is 55734586212.

It is a self number, because there is not a number n which added to its sum of digits gives 212685437550.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 708951309 + ... + 708951608.

It is an arithmetic number, because the mean of its divisors is an integer number (21977495229).

Almost surely, 2^212685437550 is an apocalyptic number.

212685437550 is an abundant number, since it is smaller than the sum of its proper divisors (314774447946).

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

212685437550 is a wasteful number, since it uses less digits than its factorization.

212685437550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417902932 (or 1417902927 counting only the distinct ones).

The product of its (nonzero) digits is 2016000, while the sum is 48.

The spelling of 212685437550 in words is "two hundred twelve billion, six hundred eighty-five million, four hundred thirty-seven thousand, five hundred fifty".