21565530703812 has 36 divisors (see below), whose sum is σ = 53453662618160. Its totient is φ = 6765656690304.

The previous prime is 21565530703753. The next prime is 21565530703831. The reversal of 21565530703812 is 21830703556512.

It is a super-2 number, since 2×21565530703812² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3109213762 + ... + 3109220697.

Almost surely, 2^{21565530703812} is an apocalyptic number.

It is an amenable number.

21565530703812 is an abundant number, since it is smaller than the sum of its proper divisors (31888131914348).

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

21565530703812 is a wasteful number, since it uses less digits than its factorization.

21565530703812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6218434500 (or 6218434481 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 21565530703812 in words is "twenty-one trillion, five hundred sixty-five billion, five hundred thirty million, seven hundred three thousand, eight hundred twelve".