23152969921 has 9 divisors (see below), whose sum is σ = 23561180161. Its totient is φ = 22751721364.

The previous prime is 23152969913. The next prime is 23152969927. The reversal of 23152969921 is 12996925132.

The square root of 23152969921 is 152161.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 23152969921 - 2³ = 23152969913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23152969927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8976210 + ... + 8978788.

Almost surely, 2^23152969921 is an apocalyptic number.

23152969921 is the 152161-st square number.

23152969921 is the 76081-st centered octagonal number.

It is an amenable number.

23152969921 is a deficient number, since it is larger than the sum of its proper divisors (408210240).

23152969921 is an frugal number, since it uses more digits than its factorization.

23152969921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276 (or 2638 counting only the distinct ones).

The product of its digits is 524880, while the sum is 49.

Multiplying 23152969921 by its sum of digits (49), we get a square (1134495526129 = 1065127²).

The spelling of 23152969921 in words is "twenty-three billion, one hundred fifty-two million, nine hundred sixty-nine thousand, nine hundred twenty-one".