21282412 has 12 divisors (see below), whose sum is σ = 37855216. Its totient is φ = 10466640.

The previous prime is 21282409. The next prime is 21282467. The reversal of 21282412 is 21428212.

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 3 ways as a sum of consecutive naturals, for example, 43368 + ... + 43855.

Almost surely, 2^21282412 is an apocalyptic number.

It is an amenable number.

21282412 is a deficient number, since it is larger than the sum of its proper divisors (16572804).

21282412 is a wasteful number, since it uses less digits than its factorization.

21282412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87288 (or 87286 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 21282412 is about 4613.2864641164. The cubic root of 21282412 is about 277.1236659299.

The spelling of 21282412 in words is "twenty-one million, two hundred eighty-two thousand, four hundred twelve".