21799312 has 10 divisors (see below), whose sum is σ = 42236198. Its totient is φ = 10899648.

The previous prime is 21799301. The next prime is 21799363. The reversal of 21799312 is 21399712.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19501056 + 2298256 = 4416^2 + 1516^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681213 + ... + 681244.

Almost surely, 2^21799312 is an apocalyptic number.

It is an amenable number.

21799312 is a deficient number, since it is larger than the sum of its proper divisors (20436886).

21799312 is a wasteful number, since it uses less digits than its factorization.

21799312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362465 (or 1362459 counting only the distinct ones).

The product of its digits is 6804, while the sum is 34.

The square root of 21799312 is about 4668.9733346850. The cubic root of 21799312 is about 279.3493053424.

The spelling of 21799312 in words is "twenty-one million, seven hundred ninety-nine thousand, three hundred twelve".