23961326521 has 4 divisors (see below), whose sum is σ = 26139628944. Its totient is φ = 21783024100.

The previous prime is 23961326507. The next prime is 23961326539. The reversal of 23961326521 is 12562316932.

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 23961326521 - 2¹¹ = 23961324473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23961326581) 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, 1089151195 + ... + 1089151216.

It is an arithmetic number, because the mean of its divisors is an integer number (6534907236).

Almost surely, 2^23961326521 is an apocalyptic number.

It is an amenable number.

23961326521 is a deficient number, since it is larger than the sum of its proper divisors (2178302423).

23961326521 is a wasteful number, since it uses less digits than its factorization.

23961326521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2178302422.

The product of its digits is 116640, while the sum is 40.

The spelling of 23961326521 in words is "twenty-three billion, nine hundred sixty-one million, three hundred twenty-six thousand, five hundred twenty-one".