21338325 has 18 divisors (see below), whose sum is σ = 38219714. Its totient is φ = 11380320.

The previous prime is 21338321. The next prime is 21338333. The reversal of 21338325 is 52383312.

21338325 is a `hidden beast` number, since 2 + 1 + 338 + 325 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1034289 + 20304036 = 1017^2 + 4506^2 .

It is not a de Polignac number, because 21338325 - 2² = 21338321 is a prime.

It is a super-2 number, since 2×21338325² = 910648227611250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 47194 + ... + 47643.

Almost surely, 2^21338325 is an apocalyptic number.

21338325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21338325 is a deficient number, since it is larger than the sum of its proper divisors (16881389).

21338325 is a wasteful number, since it uses less digits than its factorization.

21338325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94853 (or 94845 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 21338325 is about 4619.3424856791. The cubic root of 21338325 is about 277.3661394806.

The spelling of 21338325 in words is "twenty-one million, three hundred thirty-eight thousand, three hundred twenty-five".