21226504 has 16 divisors (see below), whose sum is σ = 42861420. Its totient is φ = 9796800.

The previous prime is 21226483. The next prime is 21226511. The reversal of 21226504 is 40562212.

It can be written as a sum of positive squares in 2 ways, for example, as 21068100 + 158404 = 4590^2 + 398^2 .

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, 101947 + ... + 102154.

Almost surely, 2^21226504 is an apocalyptic number.

It is an amenable number.

21226504 is an abundant number, since it is smaller than the sum of its proper divisors (21634916).

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

21226504 is a wasteful number, since it uses less digits than its factorization.

21226504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204120 (or 204116 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21226504 is about 4607.2230247732. The cubic root of 21226504 is about 276.8807890634.

Adding to 21226504 its reverse (40562212), we get a palindrome (61788716).

The spelling of 21226504 in words is "twenty-one million, two hundred twenty-six thousand, five hundred four".