211931509212 has 48 divisors (see below), whose sum is σ = 573341287680. Its totient is φ = 67572364464.

The previous prime is 211931509187. The next prime is 211931509247. The reversal of 211931509212 is 212905139112.

211931509212 is a `hidden beast` number, since 2 + 119 + 31 + 509 + 2 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 15 ways as a sum of consecutive naturals, for example, 42656838 + ... + 42661805.

It is an arithmetic number, because the mean of its divisors is an integer number (11944610160).

Almost surely, 2^211931509212 is an apocalyptic number.

It is an amenable number.

211931509212 is an abundant number, since it is smaller than the sum of its proper divisors (361409778468).

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

211931509212 is a wasteful number, since it uses less digits than its factorization.

211931509212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85318679 (or 85318671 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 211931509212 in words is "two hundred eleven billion, nine hundred thirty-one million, five hundred nine thousand, two hundred twelve".