23021831639 has 4 divisors (see below), whose sum is σ = 23053240056. Its totient is φ = 22990423224.

The previous prime is 23021831629. The next prime is 23021831659. The reversal of 23021831639 is 93613812032.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23021831639 is a prime.

It is a super-2 number, since 2×23021831639² (a number of 22 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 (23021831629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15703109 + ... + 15704574.

It is an arithmetic number, because the mean of its divisors is an integer number (5763310014).

Almost surely, 2^23021831639 is an apocalyptic number.

23021831639 is a deficient number, since it is larger than the sum of its proper divisors (31408417).

23021831639 is an equidigital number, since it uses as much as digits as its factorization.

23021831639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31408416.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 23021831639 in words is "twenty-three billion, twenty-one million, eight hundred thirty-one thousand, six hundred thirty-nine".