21412425 has 24 divisors (see below), whose sum is σ = 36944064. Its totient is φ = 10922560.

The previous prime is 21412387. The next prime is 21412429. The reversal of 21412425 is 52421412.

It is not a de Polignac number, because 21412425 - 2⁹ = 21411913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21412429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4482 + ... + 7931.

It is an arithmetic number, because the mean of its divisors is an integer number (1539336).

Almost surely, 2^21412425 is an apocalyptic number.

21412425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21412425 is a deficient number, since it is larger than the sum of its proper divisors (15531639).

21412425 is a wasteful number, since it uses less digits than its factorization.

21412425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12449 (or 12444 counting only the distinct ones).

The product of its digits is 640, while the sum is 21.

The square root of 21412425 is about 4627.3561565974. The cubic root of 21412425 is about 277.6868314120.

Adding to 21412425 its reverse (52421412), we get a palindrome (73833837).

The spelling of 21412425 in words is "twenty-one million, four hundred twelve thousand, four hundred twenty-five".