21888908 has 6 divisors (see below), whose sum is σ = 38305596. Its totient is φ = 10944452.

The previous prime is 21888907. The next prime is 21888913. The reversal of 21888908 is 80988812.

It is not an unprimeable number, because it can be changed into a prime (21888907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2736110 + ... + 2736117.

It is an arithmetic number, because the mean of its divisors is an integer number (6384266).

Almost surely, 2^21888908 is an apocalyptic number.

It is an amenable number.

21888908 is a deficient number, since it is larger than the sum of its proper divisors (16416688).

21888908 is a wasteful number, since it uses less digits than its factorization.

21888908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472231 (or 5472229 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 21888908 is about 4678.5583249544. The cubic root of 21888908 is about 279.7314942997.

The spelling of 21888908 in words is "twenty-one million, eight hundred eighty-eight thousand, nine hundred eight".