21412325 has 12 divisors (see below), whose sum is σ = 28965408. Its totient is φ = 15572400.

The previous prime is 21412319. The next prime is 21412337. The reversal of 21412325 is 52321412.

It is not a de Polignac number, because 21412325 - 2⁴ = 21412309 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21412297 and 21412306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38657 + ... + 39206.

It is an arithmetic number, because the mean of its divisors is an integer number (2413784).

Almost surely, 2^21412325 is an apocalyptic number.

21412325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21412325 is a deficient number, since it is larger than the sum of its proper divisors (7553083).

21412325 is a wasteful number, since it uses less digits than its factorization.

21412325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77884 (or 77879 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21412325 is about 4627.3453512786. The cubic root of 21412325 is about 277.6863991283.

Adding to 21412325 its reverse (52321412), we get a palindrome (73733737).

The spelling of 21412325 in words is "twenty-one million, four hundred twelve thousand, three hundred twenty-five".