21902738 has 48 divisors (see below), whose sum is σ = 40002336. Its totient is φ = 8910720.

The previous prime is 21902737. The next prime is 21902753. The reversal of 21902738 is 83720912.

It is not an unprimeable number, because it can be changed into a prime (21902737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159806 + ... + 159942.

It is an arithmetic number, because the mean of its divisors is an integer number (833382).

Almost surely, 2^21902738 is an apocalyptic number.

21902738 is a deficient number, since it is larger than the sum of its proper divisors (18099598).

21902738 is a wasteful number, since it uses less digits than its factorization.

21902738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21902738 is about 4680.0361109718. The cubic root of 21902738 is about 279.7903958535.

The spelling of 21902738 in words is "twenty-one million, nine hundred two thousand, seven hundred thirty-eight".