21738608 has 20 divisors (see below), whose sum is σ = 42294168. Its totient is φ = 10824000.

The previous prime is 21738599. The next prime is 21738617. The reversal of 21738608 is 80683712.

It is an interprime number because it is at equal distance from previous prime (21738599) and next prime (21738617).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1310 + ... + 6722.

Almost surely, 2^21738608 is an apocalyptic number.

It is an amenable number.

21738608 is a deficient number, since it is larger than the sum of its proper divisors (20555560).

21738608 is a wasteful number, since it uses less digits than its factorization.

21738608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5672 (or 5666 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21738608 is about 4662.4680159761. The cubic root of 21738608 is about 279.0897652689.

The spelling of 21738608 in words is "twenty-one million, seven hundred thirty-eight thousand, six hundred eight".