21412475 has 24 divisors (see below), whose sum is σ = 31331328. Its totient is φ = 14205600.

The previous prime is 21412451. The next prime is 21412493. The reversal of 21412475 is 57421412.

It is not a de Polignac number, because 21412475 - 2⁸ = 21412219 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3452 + ... + 7398.

It is an arithmetic number, because the mean of its divisors is an integer number (1305472).

Almost surely, 2^21412475 is an apocalyptic number.

21412475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21412475 is a deficient number, since it is larger than the sum of its proper divisors (9918853).

21412475 is a wasteful number, since it uses less digits than its factorization.

21412475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3995 (or 3990 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 21412475 is about 4627.3615592473. The cubic root of 21412475 is about 277.6870475533.

Adding to 21412475 its reverse (57421412), we get a palindrome (78833887).

The spelling of 21412475 in words is "twenty-one million, four hundred twelve thousand, four hundred seventy-five".