21801592 has 8 divisors (see below), whose sum is σ = 40878000. Its totient is φ = 10900792.

The previous prime is 21801589. The next prime is 21801601. The reversal of 21801592 is 29510812.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21801592.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1362592 + ... + 1362607.

It is an arithmetic number, because the mean of its divisors is an integer number (5109750).

Almost surely, 2^21801592 is an apocalyptic number.

It is an amenable number.

21801592 is a deficient number, since it is larger than the sum of its proper divisors (19076408).

21801592 is a wasteful number, since it uses less digits than its factorization.

21801592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2725205 (or 2725201 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 21801592 is about 4669.2174933280. The cubic root of 21801592 is about 279.3590440934.

The spelling of 21801592 in words is "twenty-one million, eight hundred one thousand, five hundred ninety-two".