21412252 has 12 divisors (see below), whose sum is σ = 37611616. Its totient is φ = 10666080.

The previous prime is 21412219. The next prime is 21412267. The reversal of 21412252 is 25221412.

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 3 ways as a sum of consecutive naturals, for example, 8793 + ... + 10960.

Almost surely, 2^21412252 is an apocalyptic number.

It is an amenable number.

21412252 is a deficient number, since it is larger than the sum of its proper divisors (16199364).

21412252 is a wasteful number, since it uses less digits than its factorization.

21412252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20028 (or 20026 counting only the distinct ones).

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

The square root of 21412252 is about 4627.3374633800. The cubic root of 21412252 is about 277.6860835603.

Adding to 21412252 its reverse (25221412), we get a palindrome (46633664).

The spelling of 21412252 in words is "twenty-one million, four hundred twelve thousand, two hundred fifty-two".