21507526506756 has 12 divisors (see below), whose sum is σ = 50184228515792. Its totient is φ = 7169175502248.

The previous prime is 21507526506751. The next prime is 21507526506779. The reversal of 21507526506756 is 65760562570512.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21507526506756² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21507526506696 and 21507526506705.

It is not an unprimeable number, because it can be changed into a prime (21507526506751) 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, 896146937770 + ... + 896146937793.

Almost surely, 2^{21507526506756} is an apocalyptic number.

It is an amenable number.

21507526506756 is an abundant number, since it is smaller than the sum of its proper divisors (28676702009036).

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

21507526506756 is a wasteful number, since it uses less digits than its factorization.

21507526506756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792293875570 (or 1792293875568 counting only the distinct ones).

The product of its (nonzero) digits is 26460000, while the sum is 57.

The spelling of 21507526506756 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, five hundred six thousand, seven hundred fifty-six".