21752338 has 4 divisors (see below), whose sum is σ = 32628510. Its totient is φ = 10876168.

The previous prime is 21752329. The next prime is 21752369. The reversal of 21752338 is 83325712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13417569 + 8334769 = 3663^2 + 2887^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5438083 + ... + 5438086.

Almost surely, 2^21752338 is an apocalyptic number.

21752338 is a deficient number, since it is larger than the sum of its proper divisors (10876172).

21752338 is a wasteful number, since it uses less digits than its factorization.

21752338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10876171.

The product of its digits is 10080, while the sum is 31.

The square root of 21752338 is about 4663.9401797193. The cubic root of 21752338 is about 279.1485101530.

The spelling of 21752338 in words is "twenty-one million, seven hundred fifty-two thousand, three hundred thirty-eight".