21591000896 has 14 divisors (see below), whose sum is σ = 42844642530. Its totient is φ = 10795500416.

The previous prime is 21591000817. The next prime is 21591000901. The reversal of 21591000896 is 69800019512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 19937440000 + 1653560896 = 141200^2 + 40664^2 .

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, 168679631 + ... + 168679758.

Almost surely, 2^21591000896 is an apocalyptic number.

It is an amenable number.

21591000896 is a deficient number, since it is larger than the sum of its proper divisors (21253641634).

21591000896 is an equidigital number, since it uses as much as digits as its factorization.

21591000896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337359401 (or 337359391 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 41.

The spelling of 21591000896 in words is "twenty-one billion, five hundred ninety-one million, eight hundred ninety-six", and thus it is an aban number.