21706595960 has 32 divisors (see below), whose sum is σ = 55816961760. Its totient is φ = 7442261376.

The previous prime is 21706595959. The next prime is 21706595987. The reversal of 21706595960 is 6959560712.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21706595899 and 21706595908.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 38761499 + ... + 38762058.

It is an arithmetic number, because the mean of its divisors is an integer number (1744280055).

Almost surely, 2^21706595960 is an apocalyptic number.

21706595960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21706595960 is an abundant number, since it is smaller than the sum of its proper divisors (34110365800).

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

21706595960 is a wasteful number, since it uses less digits than its factorization.

21706595960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77523575 (or 77523571 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 50.

The spelling of 21706595960 in words is "twenty-one billion, seven hundred six million, five hundred ninety-five thousand, nine hundred sixty".