21412473 has 4 divisors (see below), whose sum is σ = 28549968. Its totient is φ = 14274980.

The previous prime is 21412451. The next prime is 21412493. The reversal of 21412473 is 37421412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21412473 - 2⁵ = 21412441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21412493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3568743 + ... + 3568748.

It is an arithmetic number, because the mean of its divisors is an integer number (7137492).

Almost surely, 2^21412473 is an apocalyptic number.

It is an amenable number.

21412473 is a deficient number, since it is larger than the sum of its proper divisors (7137495).

21412473 is an equidigital number, since it uses as much as digits as its factorization.

21412473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7137494.

The product of its digits is 1344, while the sum is 24.

The square root of 21412473 is about 4627.3613431415. The cubic root of 21412473 is about 277.6870389077.

Adding to 21412473 its reverse (37421412), we get a palindrome (58833885).

The spelling of 21412473 in words is "twenty-one million, four hundred twelve thousand, four hundred seventy-three".