21738088 has 32 divisors (see below), whose sum is σ = 41718600. Its totient is φ = 10616832.

The previous prime is 21738049. The next prime is 21738089. The reversal of 21738088 is 88083712.

It can be written as a sum of positive squares in 4 ways, for example, as 21734244 + 3844 = 4662^2 + 62^2 .

It is not an unprimeable number, because it can be changed into a prime (21738089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84456 + ... + 84712.

Almost surely, 2^21738088 is an apocalyptic number.

It is an amenable number.

21738088 is a deficient number, since it is larger than the sum of its proper divisors (19980512).

21738088 is a wasteful number, since it uses less digits than its factorization.

21738088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 21738088 is about 4662.4122511850. The cubic root of 21738088 is about 279.0875399220.

The spelling of 21738088 in words is "twenty-one million, seven hundred thirty-eight thousand, eighty-eight".