21738252 has 24 divisors (see below), whose sum is σ = 51803136. Its totient is φ = 7091728.

The previous prime is 21738251. The next prime is 21738259. The reversal of 21738252 is 25283712.

It is not an unprimeable number, because it can be changed into a prime (21738251) 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, 18708 + ... + 19835.

It is an arithmetic number, because the mean of its divisors is an integer number (2158464).

Almost surely, 2^21738252 is an apocalyptic number.

It is an amenable number.

21738252 is an abundant number, since it is smaller than the sum of its proper divisors (30064884).

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

21738252 is a wasteful number, since it uses less digits than its factorization.

21738252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38597 (or 38595 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 21738252 is about 4662.4298386142. The cubic root of 21738252 is about 279.0882417660.

The spelling of 21738252 in words is "twenty-one million, seven hundred thirty-eight thousand, two hundred fifty-two".