211815085516 has 12 divisors (see below), whose sum is σ = 370682775288. Its totient is φ = 105905721152.

The previous prime is 211815085481. The next prime is 211815085519. The reversal of 211815085516 is 615580518112.

It is not an unprimeable number, because it can be changed into a prime (211815085519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174526 + ... + 673861.

It is an arithmetic number, because the mean of its divisors is an integer number (30890231274).

Almost surely, 2^211815085516 is an apocalyptic number.

It is an amenable number.

211815085516 is a deficient number, since it is larger than the sum of its proper divisors (158867689772).

211815085516 is a wasteful number, since it uses less digits than its factorization.

211815085516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910808 (or 910806 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 43.

The spelling of 211815085516 in words is "two hundred eleven billion, eight hundred fifteen million, eighty-five thousand, five hundred sixteen".