21368226 has 24 divisors (see below), whose sum is σ = 46703664. Its totient is φ = 6463840.

The previous prime is 21368209. The next prime is 21368233. The reversal of 21368226 is 62286312.

It is a junction number, because it is equal to n+sod(n) for n = 21368193 and 21368202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37270 + ... + 37838.

It is an arithmetic number, because the mean of its divisors is an integer number (1945986).

Almost surely, 2^21368226 is an apocalyptic number.

21368226 is an abundant number, since it is smaller than the sum of its proper divisors (25335438).

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

21368226 is an equidigital number, since it uses as much as digits as its factorization.

21368226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 585 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 21368226 is about 4622.5778522379. The cubic root of 21368226 is about 277.4956350259.

The spelling of 21368226 in words is "twenty-one million, three hundred sixty-eight thousand, two hundred twenty-six".