21133458665 has 32 divisors (see below), whose sum is σ = 28293788160. Its totient is φ = 15024672000.

The previous prime is 21133458641. The next prime is 21133458677. The reversal of 21133458665 is 56685433112.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21133458665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 414767 + ... + 462923.

It is an arithmetic number, because the mean of its divisors is an integer number (884180880).

Almost surely, 2^21133458665 is an apocalyptic number.

It is an amenable number.

21133458665 is a deficient number, since it is larger than the sum of its proper divisors (7160329495).

21133458665 is a wasteful number, since it uses less digits than its factorization.

21133458665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48353.

The product of its digits is 518400, while the sum is 44.

The spelling of 21133458665 in words is "twenty-one billion, one hundred thirty-three million, four hundred fifty-eight thousand, six hundred sixty-five".