21322525 has 12 divisors (see below), whose sum is σ = 30217312. Its totient is φ = 14621040.

The previous prime is 21322493. The next prime is 21322547. The reversal of 21322525 is 52522312.

It is not a de Polignac number, because 21322525 - 2⁵ = 21322493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21322496 and 21322505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60747 + ... + 61096.

Almost surely, 2^21322525 is an apocalyptic number.

21322525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21322525 is a deficient number, since it is larger than the sum of its proper divisors (8894787).

21322525 is a wasteful number, since it uses less digits than its factorization.

21322525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121860 (or 121855 counting only the distinct ones).

The product of its digits is 1200, while the sum is 22.

The square root of 21322525 is about 4617.6319688776. The cubic root of 21322525 is about 277.2976638294.

Adding to 21322525 its reverse (52522312), we get a palindrome (73844837).

The spelling of 21322525 in words is "twenty-one million, three hundred twenty-two thousand, five hundred twenty-five".