21599270872 has 32 divisors (see below), whose sum is σ = 40694648400. Its totient is φ = 10747440000.

The previous prime is 21599270809. The next prime is 21599270881. The reversal of 21599270872 is 27807299512.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2769154 + ... + 2776942.

Almost surely, 2^21599270872 is an apocalyptic number.

It is an amenable number.

21599270872 is a deficient number, since it is larger than the sum of its proper divisors (19095377528).

21599270872 is a wasteful number, since it uses less digits than its factorization.

21599270872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427 (or 9423 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 21599270872 in words is "twenty-one billion, five hundred ninety-nine million, two hundred seventy thousand, eight hundred seventy-two".