21633125165 has 8 divisors (see below), whose sum is σ = 27326052960. Its totient is φ = 16395631632.

The previous prime is 21633125153. The next prime is 21633125167. The reversal of 21633125165 is 56152133612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21633125165 - 2²⁰ = 21632076589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633125167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113858459 + ... + 113858648.

It is an arithmetic number, because the mean of its divisors is an integer number (3415756620).

Almost surely, 2^21633125165 is an apocalyptic number.

It is an amenable number.

21633125165 is a deficient number, since it is larger than the sum of its proper divisors (5692927795).

21633125165 is a wasteful number, since it uses less digits than its factorization.

21633125165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227717131.

The product of its digits is 32400, while the sum is 35.

Adding to 21633125165 its reverse (56152133612), we get a palindrome (77785258777).

The spelling of 21633125165 in words is "twenty-one billion, six hundred thirty-three million, one hundred twenty-five thousand, one hundred sixty-five".