23121918261 has 112 divisors (see below), whose sum is σ = 38824479232. Its totient is φ = 13667875200.

The previous prime is 23121918223. The next prime is 23121918269. The reversal of 23121918261 is 16281912132.

It is not a de Polignac number, because 23121918261 - 2²⁵ = 23088363829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121918269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 61988871 + ... + 61989243.

It is an arithmetic number, because the mean of its divisors is an integer number (346647136).

Almost surely, 2^23121918261 is an apocalyptic number.

It is an amenable number.

23121918261 is a deficient number, since it is larger than the sum of its proper divisors (15702560971).

23121918261 is a wasteful number, since it uses less digits than its factorization.

23121918261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 631 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The spelling of 23121918261 in words is "twenty-three billion, one hundred twenty-one million, nine hundred eighteen thousand, two hundred sixty-one".