21695312077860 has 24 divisors (see below), whose sum is σ = 60746873818176. Its totient is φ = 5785416554080.

The previous prime is 21695312077763. The next prime is 21695312077861. The reversal of 21695312077860 is 6877021359612.

It is a self number, because there is not a number n which added to its sum of digits gives 21695312077860.

It is not an unprimeable number, because it can be changed into a prime (21695312077861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180794267256 + ... + 180794267375.

It is an arithmetic number, because the mean of its divisors is an integer number (2531119742424).

Almost surely, 2^{21695312077860} is an apocalyptic number.

21695312077860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21695312077860 is an abundant number, since it is smaller than the sum of its proper divisors (39051561740316).

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

21695312077860 is a wasteful number, since it uses less digits than its factorization.

21695312077860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361588534643 (or 361588534641 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The spelling of 21695312077860 in words is "twenty-one trillion, six hundred ninety-five billion, three hundred twelve million, seventy-seven thousand, eight hundred sixty".