21459874 has 32 divisors (see below), whose sum is σ = 35251200. Its totient is φ = 9768000.

The previous prime is 21459869. The next prime is 21459887. The reversal of 21459874 is 47895412.

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 15 ways as a sum of consecutive naturals, for example, 143952 + ... + 144100.

It is an arithmetic number, because the mean of its divisors is an integer number (1101600).

Almost surely, 2^21459874 is an apocalyptic number.

21459874 is a deficient number, since it is larger than the sum of its proper divisors (13791326).

21459874 is a wasteful number, since it uses less digits than its factorization.

21459874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306.

The product of its digits is 80640, while the sum is 40.

The square root of 21459874 is about 4632.4803291541. The cubic root of 21459874 is about 277.8917940598.

The spelling of 21459874 in words is "twenty-one million, four hundred fifty-nine thousand, eight hundred seventy-four".