23701921 has 2 divisors, whose sum is σ = 23701922. Its totient is φ = 23701920.

The previous prime is 23701919. The next prime is 23701933. The reversal of 23701921 is 12910732.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22467600 + 1234321 = 4740^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 23701921 - 2¹ = 23701919 is a prime.

Together with 23701919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23701981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11850960 + 11850961.

It is an arithmetic number, because the mean of its divisors is an integer number (11850961).

Almost surely, 2^23701921 is an apocalyptic number.

It is an amenable number.

23701921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23701921 is an equidigital number, since it uses as much as digits as its factorization.

23701921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 23701921 is about 4868.4618720906. The cubic root of 23701921 is about 287.2507571428.

The spelling of 23701921 in words is "twenty-three million, seven hundred one thousand, nine hundred twenty-one".