23772921 has 4 divisors (see below), whose sum is σ = 31697232. Its totient is φ = 15848612.

The previous prime is 23772901. The next prime is 23772923. The reversal of 23772921 is 12927732.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23772921 - 2¹⁰ = 23771897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23772923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3962151 + ... + 3962156.

It is an arithmetic number, because the mean of its divisors is an integer number (7924308).

Almost surely, 2^23772921 is an apocalyptic number.

It is an amenable number.

23772921 is a deficient number, since it is larger than the sum of its proper divisors (7924311).

23772921 is an equidigital number, since it uses as much as digits as its factorization.

23772921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924310.

The product of its digits is 10584, while the sum is 33.

The square root of 23772921 is about 4875.7482502689. The cubic root of 23772921 is about 287.5372947208.

The spelling of 23772921 in words is "twenty-three million, seven hundred seventy-two thousand, nine hundred twenty-one".