23171002021 has 4 divisors (see below), whose sum is σ = 23664002112. Its totient is φ = 22678001932.

The previous prime is 23171002009. The next prime is 23171002027. The reversal of 23171002021 is 12020017132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23171002021 - 2²⁵ = 23137447589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23171002021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23171002027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246499975 + ... + 246500068.

It is an arithmetic number, because the mean of its divisors is an integer number (5916000528).

Almost surely, 2^23171002021 is an apocalyptic number.

It is an amenable number.

23171002021 is a deficient number, since it is larger than the sum of its proper divisors (493000091).

23171002021 is an equidigital number, since it uses as much as digits as its factorization.

23171002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493000090.

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 23171002021 its reverse (12020017132), we get a palindrome (35191019153).

The spelling of 23171002021 in words is "twenty-three billion, one hundred seventy-one million, two thousand, twenty-one".