23872176505721 has 2 divisors, whose sum is σ = 23872176505722. Its totient is φ = 23872176505720.

The previous prime is 23872176505687. The next prime is 23872176505729. The reversal of 23872176505721 is 12750567127832.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20446123584121 + 3426052921600 = 4521739^2 + 1850960^2 .

It is a cyclic number.

It is not a de Polignac number, because 23872176505721 - 2³⁰ = 23871102763897 is a prime.

It is a super-2 number, since 2×23872176505721² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23872176505729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11936088252860 + 11936088252861.

It is an arithmetic number, because the mean of its divisors is an integer number (11936088252861).

Almost surely, 2^{23872176505721} is an apocalyptic number.

It is an amenable number.

23872176505721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23872176505721 is an equidigital number, since it uses as much as digits as its factorization.

23872176505721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9878400, while the sum is 56.

The spelling of 23872176505721 in words is "twenty-three trillion, eight hundred seventy-two billion, one hundred seventy-six million, five hundred five thousand, seven hundred twenty-one".