21823252 has 12 divisors (see below), whose sum is σ = 41662656. Its totient is φ = 9919640.

The previous prime is 21823247. The next prime is 21823261. The reversal of 21823252 is 25232812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247948 + ... + 248035.

It is an arithmetic number, because the mean of its divisors is an integer number (3471888).

Almost surely, 2^21823252 is an apocalyptic number.

21823252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21823252 is a deficient number, since it is larger than the sum of its proper divisors (19839404).

21823252 is a wasteful number, since it uses less digits than its factorization.

21823252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495998 (or 495996 counting only the distinct ones).

The product of its digits is 1920, while the sum is 25.

The square root of 21823252 is about 4671.5363639813. The cubic root of 21823252 is about 279.4515283812.

The spelling of 21823252 in words is "twenty-one million, eight hundred twenty-three thousand, two hundred fifty-two".