21799408 has 10 divisors (see below), whose sum is σ = 42236384. Its totient is φ = 10899696.

The previous prime is 21799397. The next prime is 21799439. The reversal of 21799408 is 80499712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 681216 + ... + 681247.

Almost surely, 2^21799408 is an apocalyptic number.

It is an amenable number.

21799408 is a deficient number, since it is larger than the sum of its proper divisors (20436976).

21799408 is a wasteful number, since it uses less digits than its factorization.

21799408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362471 (or 1362465 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 21799408 is about 4668.9836153064. The cubic root of 21799408 is about 279.3497154088.

The spelling of 21799408 in words is "twenty-one million, seven hundred ninety-nine thousand, four hundred eight".