21800368 has 10 divisors (see below), whose sum is σ = 42238244. Its totient is φ = 10900176.

The previous prime is 21800357. The next prime is 21800369. The reversal of 21800368 is 86300812.

It is not an unprimeable number, because it can be changed into a prime (21800369) by changing a digit.

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, 681246 + ... + 681277.

Almost surely, 2^21800368 is an apocalyptic number.

It is an amenable number.

21800368 is a deficient number, since it is larger than the sum of its proper divisors (20437876).

21800368 is a wasteful number, since it uses less digits than its factorization.

21800368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362531 (or 1362525 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21800368 is about 4669.0864202754. The cubic root of 21800368 is about 279.3538160062.

The spelling of 21800368 in words is "twenty-one million, eight hundred thousand, three hundred sixty-eight".