23720093921 has 2 divisors, whose sum is σ = 23720093922. Its totient is φ = 23720093920.

The previous prime is 23720093899. The next prime is 23720093923. The reversal of 23720093921 is 12939002732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18283096225 + 5436997696 = 135215^2 + 73736^2 .

It is a cyclic number.

It is not a de Polignac number, because 23720093921 - 2⁶ = 23720093857 is a prime.

It is a super-2 number, since 2×23720093921² (a number of 22 digits) contains 22 as substring.

Together with 23720093923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23720093923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11860046960 + 11860046961.

It is an arithmetic number, because the mean of its divisors is an integer number (11860046961).

Almost surely, 2^23720093921 is an apocalyptic number.

It is an amenable number.

23720093921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23720093921 is an equidigital number, since it uses as much as digits as its factorization.

23720093921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 38.

The spelling of 23720093921 in words is "twenty-three billion, seven hundred twenty million, ninety-three thousand, nine hundred twenty-one".