21244338 has 12 divisors (see below), whose sum is σ = 46029438. Its totient is φ = 7081440.

The previous prime is 21244309. The next prime is 21244367. The reversal of 21244338 is 83344212.

21244338 is a `hidden beast` number, since 212 + 443 + 3 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21244309) and next prime (21244367).

It can be written as a sum of positive squares in only one way, i.e., 18122049 + 3122289 = 4257^2 + 1767^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590103 + ... + 590138.

Almost surely, 2^21244338 is an apocalyptic number.

21244338 is an abundant number, since it is smaller than the sum of its proper divisors (24785100).

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

21244338 is a wasteful number, since it uses less digits than its factorization.

21244338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180249 (or 1180246 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21244338 is about 4609.1580576066. The cubic root of 21244338 is about 276.9583102250.

The spelling of 21244338 in words is "twenty-one million, two hundred forty-four thousand, three hundred thirty-eight".