23571021961 has 4 divisors (see below), whose sum is σ = 23571897552. Its totient is φ = 23570146372.

The previous prime is 23571021949. The next prime is 23571021967. The reversal of 23571021961 is 16912017532.

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 23571021961 - 2¹³ = 23571013769 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 23571021961.

It is not an unprimeable number, because it can be changed into a prime (23571021967) 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, 396091 + ... + 451696.

It is an arithmetic number, because the mean of its divisors is an integer number (5892974388).

Almost surely, 2^23571021961 is an apocalyptic number.

It is an amenable number.

23571021961 is a deficient number, since it is larger than the sum of its proper divisors (875591).

23571021961 is an equidigital number, since it uses as much as digits as its factorization.

23571021961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875590.

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 23571021961 in words is "twenty-three billion, five hundred seventy-one million, twenty-one thousand, nine hundred sixty-one".