23292721 has 16 divisors (see below), whose sum is σ = 25302528. Its totient is φ = 21384000.

The previous prime is 23292719. The next prime is 23292739. The reversal of 23292721 is 12729232.

It is a 3-Lehmer number, since φ(23292721) divides (23292721-1)³.

It is a cyclic number.

It is not a de Polignac number, because 23292721 - 2¹ = 23292719 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a deceptive number, since it divides R_23292720.

It is a Duffinian number.

Its product of digits (3024) is a multiple of the sum of its prime divisors (432).

It is a self number, because there is not a number n which added to its sum of digits gives 23292721.

It is not an unprimeable number, because it can be changed into a prime (23292761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85816 + ... + 86086.

It is an arithmetic number, because the mean of its divisors is an integer number (1581408).

Almost surely, 2^23292721 is an apocalyptic number.

It is an amenable number.

23292721 is a deficient number, since it is larger than the sum of its proper divisors (2009807).

23292721 is a wasteful number, since it uses less digits than its factorization.

23292721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432.

The product of its digits is 3024, while the sum is 28.

The square root of 23292721 is about 4826.2533087272. The cubic root of 23292721 is about 285.5880788191.

It can be divided in two parts, 2329 and 2721, that added together give a triangular number (5050 = T₁₀₀).

The spelling of 23292721 in words is "twenty-three million, two hundred ninety-two thousand, seven hundred twenty-one".