21624155023231 has 4 divisors (see below), whose sum is σ = 21624225243264. Its totient is φ = 21624084803200.

The previous prime is 21624155023147. The next prime is 21624155023249. The reversal of 21624155023231 is 13232055142612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21624155023231 - 2¹⁵ = 21624154990463 is a prime.

It is a super-2 number, since 2×21624155023231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21624155023271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34646050 + ... + 35264671.

It is an arithmetic number, because the mean of its divisors is an integer number (5406056310816).

Almost surely, 2^{21624155023231} is an apocalyptic number.

21624155023231 is a deficient number, since it is larger than the sum of its proper divisors (70220033).

21624155023231 is an equidigital number, since it uses as much as digits as its factorization.

21624155023231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70220032.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21624155023231 in words is "twenty-one trillion, six hundred twenty-four billion, one hundred fifty-five million, twenty-three thousand, two hundred thirty-one".