21823396 has 24 divisors (see below), whose sum is σ = 43747200. Its totient is φ = 9331392.

The previous prime is 21823387. The next prime is 21823397. The reversal of 21823396 is 69332812.

It is a happy number.

It is a super-2 number, since 2×21823396² = 952521225945632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21823397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20280 + ... + 21328.

It is an arithmetic number, because the mean of its divisors is an integer number (1822800).

Almost surely, 2^21823396 is an apocalyptic number.

It is an amenable number.

21823396 is an abundant number, since it is smaller than the sum of its proper divisors (21923804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21823396 is a wasteful number, since it uses less digits than its factorization.

21823396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803 (or 1801 counting only the distinct ones).

The product of its digits is 15552, while the sum is 34.

The square root of 21823396 is about 4671.5517764443. The cubic root of 21823396 is about 279.4521430304.

The spelling of 21823396 in words is "twenty-one million, eight hundred twenty-three thousand, three hundred ninety-six".