23617977421 has 4 divisors (see below), whose sum is σ = 23762873152. Its totient is φ = 23473081692.

The previous prime is 23617977373. The next prime is 23617977443. The reversal of 23617977421 is 12477971632.

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 23617977421 - 2²³ = 23609588813 is a prime.

It is a super-2 number, since 2×23617977421² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23617977451) 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, 72447621 + ... + 72447946.

It is an arithmetic number, because the mean of its divisors is an integer number (5940718288).

Almost surely, 2^23617977421 is an apocalyptic number.

It is an amenable number.

23617977421 is a deficient number, since it is larger than the sum of its proper divisors (144895731).

23617977421 is a wasteful number, since it uses less digits than its factorization.

23617977421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144895730.

The product of its digits is 889056, while the sum is 49.

It can be divided in two parts, 236179 and 77421, that added together give a square (313600 = 560²).

The spelling of 23617977421 in words is "twenty-three billion, six hundred seventeen million, nine hundred seventy-seven thousand, four hundred twenty-one".