21258412 has 12 divisors (see below), whose sum is σ = 42516880. Its totient is φ = 9110736.

The previous prime is 21258407. The next prime is 21258431. The reversal of 21258412 is 21485212.

21258412 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, 379587 + ... + 379642.

Almost surely, 2^21258412 is an apocalyptic number.

It is an amenable number.

21258412 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.

21258412 is a wasteful number, since it uses less digits than its factorization.

21258412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759240 (or 759238 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 21258412 is about 4610.6845478736. The cubic root of 21258412 is about 277.0194567261.

The spelling of 21258412 in words is "twenty-one million, two hundred fifty-eight thousand, four hundred twelve".