21430874 has 8 divisors (see below), whose sum is σ = 32284980. Its totient is φ = 10669216.

The previous prime is 21430861. The next prime is 21430909. The reversal of 21430874 is 47803412.

It can be written as a sum of positive squares in 2 ways, for example, as 16345849 + 5085025 = 4043^2 + 2255^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22529 + ... + 23460.

Almost surely, 2^21430874 is an apocalyptic number.

21430874 is a deficient number, since it is larger than the sum of its proper divisors (10854106).

21430874 is a wasteful number, since it uses less digits than its factorization.

21430874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46224.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 21430874 is about 4629.3491983215. The cubic root of 21430874 is about 277.7665604122.

The spelling of 21430874 in words is "twenty-one million, four hundred thirty thousand, eight hundred seventy-four".