21801392 has 20 divisors (see below), whose sum is σ = 42653520. Its totient is φ = 10794048.

The previous prime is 21801383. The next prime is 21801407. The reversal of 21801392 is 29310812.

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 in 3 ways as a sum of consecutive naturals, for example, 4967 + ... + 8262.

It is an arithmetic number, because the mean of its divisors is an integer number (2132676).

Almost surely, 2^21801392 is an apocalyptic number.

It is an amenable number.

21801392 is a deficient number, since it is larger than the sum of its proper divisors (20852128).

21801392 is a wasteful number, since it uses less digits than its factorization.

21801392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340 (or 13334 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21801392 is about 4669.1960764140. The cubic root of 21801392 is about 279.3581898441.

The spelling of 21801392 in words is "twenty-one million, eight hundred one thousand, three hundred ninety-two".