21258474 has 8 divisors (see below), whose sum is σ = 42516960. Its totient is φ = 7086156.

The previous prime is 21258443. The next prime is 21258481. The reversal of 21258474 is 47485212.

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

21258474 is an admirable number.

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, 1771534 + ... + 1771545.

It is an arithmetic number, because the mean of its divisors is an integer number (5314620).

Almost surely, 2^21258474 is an apocalyptic number.

21258474 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21258474 is a wasteful number, since it uses less digits than its factorization.

21258474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3543084.

The product of its digits is 17920, while the sum is 33.

The square root of 21258474 is about 4610.6912713822. The cubic root of 21258474 is about 277.0197260342.

The spelling of 21258474 in words is "twenty-one million, two hundred fifty-eight thousand, four hundred seventy-four".