21813226 has 8 divisors (see below), whose sum is σ = 32748480. Its totient is φ = 10897068.

The previous prime is 21813179. The next prime is 21813247. The reversal of 21813226 is 62231812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21813226.

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, 1456 + ... + 6763.

It is an arithmetic number, because the mean of its divisors is an integer number (4093560).

Almost surely, 2^21813226 is an apocalyptic number.

21813226 is a deficient number, since it is larger than the sum of its proper divisors (10935254).

21813226 is a wasteful number, since it uses less digits than its factorization.

21813226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9548.

The product of its digits is 1152, while the sum is 25.

The square root of 21813226 is about 4670.4631461987. The cubic root of 21813226 is about 279.4087267829.

The spelling of 21813226 in words is "twenty-one million, eight hundred thirteen thousand, two hundred twenty-six".