21523226 has 8 divisors (see below), whose sum is σ = 32647860. Its totient is φ = 10640608.

The previous prime is 21523171. The next prime is 21523261. The reversal of 21523226 is 62232512.

It can be written as a sum of positive squares in 2 ways, for example, as 21169201 + 354025 = 4601^2 + 595^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60281 + ... + 60636.

Almost surely, 2^21523226 is an apocalyptic number.

21523226 is a deficient number, since it is larger than the sum of its proper divisors (11124634).

21523226 is a wasteful number, since it uses less digits than its factorization.

21523226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121008.

The product of its digits is 1440, while the sum is 23.

The square root of 21523226 is about 4639.3130957072. The cubic root of 21523226 is about 278.1649815181.

Adding to 21523226 its reverse (62232512), we get a palindrome (83755738).

The spelling of 21523226 in words is "twenty-one million, five hundred twenty-three thousand, two hundred twenty-six".