21194459 has 16 divisors (see below), whose sum is σ = 25075680. Its totient is φ = 17765280.

The previous prime is 21194441. The next prime is 21194479. The reversal of 21194459 is 95449112.

It is not a de Polignac number, because 21194459 - 2⁸ = 21194203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21194479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23729 + ... + 24605.

It is an arithmetic number, because the mean of its divisors is an integer number (1567230).

Almost surely, 2^21194459 is an apocalyptic number.

21194459 is a deficient number, since it is larger than the sum of its proper divisors (3881221).

21194459 is an equidigital number, since it uses as much as digits as its factorization.

21194459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927 (or 901 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 21194459 is about 4603.7440198169. The cubic root of 21194459 is about 276.7413860863.

The spelling of 21194459 in words is "twenty-one million, one hundred ninety-four thousand, four hundred fifty-nine".