21922008 has 16 divisors (see below), whose sum is σ = 54805080. Its totient is φ = 7307328.

The previous prime is 21922007. The next prime is 21922009. The reversal of 21922008 is 80022912.

It is an interprime number because it is at equal distance from previous prime (21922007) and next prime (21922009).

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 913417 = 21922008 / (2 + 1 + 9 + 2 + 2 + 0 + 0 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456685 + ... + 456732.

Almost surely, 2^21922008 is an apocalyptic number.

It is an amenable number.

21922008 is an abundant number, since it is smaller than the sum of its proper divisors (32883072).

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

21922008 is a wasteful number, since it uses less digits than its factorization.

21922008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913426 (or 913422 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 21922008 is about 4682.0944031491. The cubic root of 21922008 is about 279.8724248756.

The spelling of 21922008 in words is "twenty-one million, nine hundred twenty-two thousand, eight".