21325239 has 48 divisors (see below), whose sum is σ = 35773920. Its totient is φ = 12130560.

The previous prime is 21325219. The next prime is 21325279. The reversal of 21325239 is 93252312.

21325239 is a `hidden beast` number, since 2 + 132 + 523 + 9 = 666.

It is not a de Polignac number, because 21325239 - 2⁸ = 21324983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21325219) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 117729 + ... + 117909.

It is an arithmetic number, because the mean of its divisors is an integer number (745290).

Almost surely, 2^21325239 is an apocalyptic number.

21325239 is a deficient number, since it is larger than the sum of its proper divisors (14448681).

21325239 is a wasteful number, since it uses less digits than its factorization.

21325239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 269 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 21325239 is about 4617.9258330987. The cubic root of 21325239 is about 277.3094284450.

It can be divided in two parts, 213 and 25239, that added together give a palindrome (25452).

The spelling of 21325239 in words is "twenty-one million, three hundred twenty-five thousand, two hundred thirty-nine".