23381152663721 has 4 divisors (see below), whose sum is σ = 23381163781572. Its totient is φ = 23381141545872.

The previous prime is 23381152663717. The next prime is 23381152663747. The reversal of 23381152663721 is 12736625118332.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7571495173225 + 15809657490496 = 2751635^2 + 3976136^2 .

It is a cyclic number.

It is not a de Polignac number, because 23381152663721 - 2² = 23381152663717 is a prime.

It is a super-2 number, since 2×23381152663721² (a number of 28 digits) contains 22 as substring.

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 23381152663721.

It is not an unprimeable number, because it can be changed into a prime (23381152623721) 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, 1334066 + ... + 6967211.

It is an arithmetic number, because the mean of its divisors is an integer number (5845290945393).

Almost surely, 2^{23381152663721} is an apocalyptic number.

It is an amenable number.

23381152663721 is a deficient number, since it is larger than the sum of its proper divisors (11117851).

23381152663721 is an equidigital number, since it uses as much as digits as its factorization.

23381152663721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11117850.

The product of its digits is 2177280, while the sum is 50.

The spelling of 23381152663721 in words is "twenty-three trillion, three hundred eighty-one billion, one hundred fifty-two million, six hundred sixty-three thousand, seven hundred twenty-one".