21599992 has 8 divisors (see below), whose sum is σ = 40500000. Its totient is φ = 10799992.

The previous prime is 21599987. The next prime is 21600001. The reversal of 21599992 is 29999512.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1349992 + ... + 1350007.

It is an arithmetic number, because the mean of its divisors is an integer number (5062500).

Almost surely, 2^21599992 is an apocalyptic number.

It is an amenable number.

21599992 is a deficient number, since it is larger than the sum of its proper divisors (18900008).

21599992 is a wasteful number, since it uses less digits than its factorization.

21599992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2700005 (or 2700001 counting only the distinct ones).

The product of its digits is 131220, while the sum is 46.

The square root of 21599992 is about 4647.5791547859. The cubic root of 21599992 is about 278.4952956346.

The spelling of 21599992 in words is "twenty-one million, five hundred ninety-nine thousand, nine hundred ninety-two".