21046312 has 32 divisors (see below), whose sum is σ = 45302400. Its totient is φ = 8979264.

The previous prime is 21046309. The next prime is 21046327. The reversal of 21046312 is 21364012.

21046312 is a modest number, since divided by 6312 gives 2104 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 21046312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14014 + ... + 15442.

It is an arithmetic number, because the mean of its divisors is an integer number (1415700).

Almost surely, 2^21046312 is an apocalyptic number.

It is an amenable number.

21046312 is an abundant number, since it is smaller than the sum of its proper divisors (24256088).

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

21046312 is a wasteful number, since it uses less digits than its factorization.

21046312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1705 (or 1701 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 21046312 is about 4587.6259655730. The cubic root of 21046312 is about 276.0950803131.

The spelling of 21046312 in words is "twenty-one million, forty-six thousand, three hundred twelve".