21400479 has 12 divisors (see below), whose sum is σ = 32539000. Its totient is φ = 13515984.

The previous prime is 21400459. The next prime is 21400487. The reversal of 21400479 is 97400412.

It is a happy number.

It is not a de Polignac number, because 21400479 - 2⁹ = 21399967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62404 + ... + 62745.

Almost surely, 2^21400479 is an apocalyptic number.

21400479 is a deficient number, since it is larger than the sum of its proper divisors (11138521).

21400479 is a wasteful number, since it uses less digits than its factorization.

21400479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125174 (or 125171 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21400479 is about 4626.0651746382. The cubic root of 21400479 is about 277.6351812762.

The spelling of 21400479 in words is "twenty-one million, four hundred thousand, four hundred seventy-nine".