21250912 has 12 divisors (see below), whose sum is σ = 41837796. Its totient is φ = 10625440.

The previous prime is 21250877. The next prime is 21250961. The reversal of 21250912 is 21905212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332014 + ... + 332077.

It is an arithmetic number, because the mean of its divisors is an integer number (3486483).

Almost surely, 2^21250912 is an apocalyptic number.

It is an amenable number.

21250912 is a deficient number, since it is larger than the sum of its proper divisors (20586884).

21250912 is an equidigital number, since it uses as much as digits as its factorization.

21250912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664101 (or 664093 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 21250912 is about 4609.8711478739. The cubic root of 21250912 is about 276.9868752660.

It can be divided in two parts, 212509 and 12, that added together give a square (212521 = 461²).

The spelling of 21250912 in words is "twenty-one million, two hundred fifty thousand, nine hundred twelve".