21076844560 has 20 divisors (see below), whose sum is σ = 49003663788. Its totient is φ = 8430737792.

The previous prime is 21076844543. The next prime is 21076844567. The reversal of 21076844560 is 6544867012.

It can be written as a sum of positive squares in 2 ways, for example, as 12942247696 + 8134596864 = 113764^2 + 90192^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (21076844567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131730199 + ... + 131730358.

Almost surely, 2^21076844560 is an apocalyptic number.

21076844560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21076844560 is an abundant number, since it is smaller than the sum of its proper divisors (27926819228).

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

21076844560 is a wasteful number, since it uses less digits than its factorization.

21076844560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263460570 (or 263460564 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 21076844560 in words is "twenty-one billion, seventy-six million, eight hundred forty-four thousand, five hundred sixty".