211538502156 has 24 divisors (see below), whose sum is σ = 493624544560. Its totient is φ = 70507876032.

The previous prime is 211538502139. The next prime is 211538502187. The reversal of 211538502156 is 651205835112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 439891 + ... + 785226.

Almost surely, 2^211538502156 is an apocalyptic number.

It is an amenable number.

211538502156 is an abundant number, since it is smaller than the sum of its proper divisors (282086042404).

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

211538502156 is a wasteful number, since it uses less digits than its factorization.

211538502156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239513 (or 1239511 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 39.

The spelling of 211538502156 in words is "two hundred eleven billion, five hundred thirty-eight million, five hundred two thousand, one hundred fifty-six".