21156086086 has 16 divisors (see below), whose sum is σ = 32545491264. Its totient is φ = 10308700584.

The previous prime is 21156086071. The next prime is 21156086143. The reversal of 21156086086 is 68068065112.

It is a Harshad number since it is a multiple of its sum of digits (43).

21156086086 is a modest number, since divided by 86086 gives 21156 as remainder.

It is a congruent number.

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, 239556 + ... + 315751.

It is an arithmetic number, because the mean of its divisors is an integer number (2034093204).

Almost surely, 2^21156086086 is an apocalyptic number.

21156086086 is a deficient number, since it is larger than the sum of its proper divisors (11389405178).

21156086086 is a wasteful number, since it uses less digits than its factorization.

21156086086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555795.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 21156086086 in words is "twenty-one billion, one hundred fifty-six million, eighty-six thousand, eighty-six".