11921590985 has 16 divisors (see below), whose sum is σ = 14575952640. Its totient is φ = 9358727040.

The previous prime is 11921590979. The next prime is 11921591009. The reversal of 11921590985 is 58909512911.

It is not a de Polignac number, because 11921590985 - 2⁸ = 11921590729 is a prime.

It is a super-2 number, since 2×11921590985² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28196 + ... + 156965.

It is an arithmetic number, because the mean of its divisors is an integer number (910997040).

Almost surely, 2^11921590985 is an apocalyptic number.

It is an amenable number.

11921590985 is a deficient number, since it is larger than the sum of its proper divisors (2654361655).

11921590985 is a wasteful number, since it uses less digits than its factorization.

11921590985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185408.

The product of its (nonzero) digits is 291600, while the sum is 50.

The spelling of 11921590985 in words is "eleven billion, nine hundred twenty-one million, five hundred ninety thousand, nine hundred eighty-five".