21605006896 has 30 divisors (see below), whose sum is σ = 46011080276. Its totient is φ = 9820456800.

The previous prime is 21605006887. The next prime is 21605006911. The reversal of 21605006896 is 69860050612.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5577870 + ... + 5581741.

Almost surely, 2^21605006896 is an apocalyptic number.

It is an amenable number.

21605006896 is an abundant number, since it is smaller than the sum of its proper divisors (24406073380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21605006896 is a wasteful number, since it uses less digits than its factorization.

21605006896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11159641 (or 11159624 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 21605006896 in words is "twenty-one billion, six hundred five million, six thousand, eight hundred ninety-six".