21883908 has 12 divisors (see below), whose sum is σ = 51062480. Its totient is φ = 7294632.

The previous prime is 21883907. The next prime is 21883921. The reversal of 21883908 is 80938812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21883907) by changing a digit.

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, 911818 + ... + 911841.

Almost surely, 2^21883908 is an apocalyptic number.

It is an amenable number.

21883908 is an abundant number, since it is smaller than the sum of its proper divisors (29178572).

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

21883908 is a wasteful number, since it uses less digits than its factorization.

21883908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823666 (or 1823664 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 21883908 is about 4678.0239417942. The cubic root of 21883908 is about 279.7101933440.

It can be divided in two parts, 21883 and 908, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 21883908 in words is "twenty-one million, eight hundred eighty-three thousand, nine hundred eight".