21223804 has 12 divisors (see below), whose sum is σ = 42447664. Its totient is φ = 9095904.

The previous prime is 21223793. The next prime is 21223823. The reversal of 21223804 is 40832212.

21223804 is an admirable number.

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, 378969 + ... + 379024.

Almost surely, 2^21223804 is an apocalyptic number.

It is an amenable number.

21223804 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21223804 is a wasteful number, since it uses less digits than its factorization.

21223804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758004 (or 758002 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21223804 is about 4606.9299972975. The cubic root of 21223804 is about 276.8690488694.

The spelling of 21223804 in words is "twenty-one million, two hundred twenty-three thousand, eight hundred four".