21763945437856 has 24 divisors (see below), whose sum is σ = 42850405552500. Its totient is φ = 10881302757888.

The previous prime is 21763945437853. The next prime is 21763945437929. The reversal of 21763945437856 is 65873454936712.

It can be written as a sum of positive squares in 2 ways, for example, as 20948745920400 + 815199517456 = 4576980^2 + 902884^2 .

It is not an unprimeable number, because it can be changed into a prime (21763945437851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20408191 + ... + 21448126.

Almost surely, 2^{21763945437856} is an apocalyptic number.

It is an amenable number.

21763945437856 is a deficient number, since it is larger than the sum of its proper divisors (21086460114644).

21763945437856 is a wasteful number, since it uses less digits than its factorization.

21763945437856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41872576 (or 41872568 counting only the distinct ones).

The product of its digits is 914457600, while the sum is 70.

The spelling of 21763945437856 in words is "twenty-one trillion, seven hundred sixty-three billion, nine hundred forty-five million, four hundred thirty-seven thousand, eight hundred fifty-six".