23207921 has 6 divisors (see below), whose sum is σ = 25509666. Its totient is φ = 21098000.

The previous prime is 23207893. The next prime is 23207923. The reversal of 23207921 is 12970232.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 10817521 = 3520^2 + 3289^2 .

It is not a de Polignac number, because 23207921 - 2¹⁸ = 22945777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23207923) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95780 + ... + 96021.

It is an arithmetic number, because the mean of its divisors is an integer number (4251611).

Almost surely, 2^23207921 is an apocalyptic number.

It is an amenable number.

23207921 is a deficient number, since it is larger than the sum of its proper divisors (2301745).

23207921 is a wasteful number, since it uses less digits than its factorization.

23207921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191823 (or 191812 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 23207921 is about 4817.4600154023. The cubic root of 23207921 is about 285.2410846080.

The spelling of 23207921 in words is "twenty-three million, two hundred seven thousand, nine hundred twenty-one".