21412225 has 12 divisors (see below), whose sum is σ = 26625280. Its totient is φ = 17082000.

The previous prime is 21412219. The next prime is 21412267. The reversal of 21412225 is 52221412.

It is not a de Polignac number, because 21412225 - 2³ = 21412217 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10000 + ... + 11950.

Almost surely, 2^21412225 is an apocalyptic number.

21412225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21412225 is a deficient number, since it is larger than the sum of its proper divisors (5213055).

21412225 is a wasteful number, since it uses less digits than its factorization.

21412225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400 (or 2395 counting only the distinct ones).

The product of its digits is 320, while the sum is 19.

The square root of 21412225 is about 4627.3345459346. The cubic root of 21412225 is about 277.6859668432.

Adding to 21412225 its reverse (52221412), we get a palindrome (73633637).

The spelling of 21412225 in words is "twenty-one million, four hundred twelve thousand, two hundred twenty-five".