21332525 has 12 divisors (see below), whose sum is σ = 26632224. Its totient is φ = 16950000.

The previous prime is 21332503. The next prime is 21332527. The reversal of 21332525 is 52523312.

It is a de Polignac number, because none of the positive numbers 2^k-21332525 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21332525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21332527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 950 + ... + 6600.

It is an arithmetic number, because the mean of its divisors is an integer number (2219352).

Almost surely, 2^21332525 is an apocalyptic number.

21332525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21332525 is a deficient number, since it is larger than the sum of its proper divisors (5299699).

21332525 is a wasteful number, since it uses less digits than its factorization.

21332525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5812 (or 5807 counting only the distinct ones).

The product of its digits is 1800, while the sum is 23.

The square root of 21332525 is about 4618.7146480379. The cubic root of 21332525 is about 277.3410067771.

Adding to 21332525 its reverse (52523312), we get a palindrome (73855837).

The spelling of 21332525 in words is "twenty-one million, three hundred thirty-two thousand, five hundred twenty-five".