21560810896 has 15 divisors (see below), whose sum is σ = 41775209121. Its totient is φ = 10780111776.

The previous prime is 21560810867. The next prime is 21560810911. The reversal of 21560810896 is 69801806512.

The square root of 21560810896 is 146836.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9636170896 + 11924640000 = 98164^2 + 109200^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 568990 + ... + 605698.

Almost surely, 2^21560810896 is an apocalyptic number.

21560810896 is the 146836-th square number.

It is an amenable number.

21560810896 is a deficient number, since it is larger than the sum of its proper divisors (20214398225).

21560810896 is an frugal number, since it uses more digits than its factorization.

21560810896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73426 (or 36711 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 21560810896 in words is "twenty-one billion, five hundred sixty million, eight hundred ten thousand, eight hundred ninety-six".