21226908 has 24 divisors (see below), whose sum is σ = 49610512. Its totient is φ = 7064064.

The previous prime is 21226903. The next prime is 21226921. The reversal of 21226908 is 80962212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21226903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9516 + ... + 11532.

Almost surely, 2^21226908 is an apocalyptic number.

It is an amenable number.

21226908 is an abundant number, since it is smaller than the sum of its proper divisors (28383604).

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

21226908 is a wasteful number, since it uses less digits than its factorization.

21226908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901 (or 2899 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21226908 is about 4607.2668687629. The cubic root of 21226908 is about 276.8825456587.

The spelling of 21226908 in words is "twenty-one million, two hundred twenty-six thousand, nine hundred eight".