21340595694864 has 80 divisors (see below), whose sum is σ = 55367130562560. Its totient is φ = 7082925010560.

The previous prime is 21340595694863. The next prime is 21340595694877. The reversal of 21340595694864 is 46849659504312.

It is a super-2 number, since 2×21340595694864² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21340595694795 and 21340595694804.

It is not an unprimeable number, because it can be changed into a prime (21340595694863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100239249 + ... + 100451919.

It is an arithmetic number, because the mean of its divisors is an integer number (692089132032).

Almost surely, 2^{21340595694864} is an apocalyptic number.

21340595694864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21340595694864 is an abundant number, since it is smaller than the sum of its proper divisors (34026534867696).

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

21340595694864 is a wasteful number, since it uses less digits than its factorization.

21340595694864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221668 (or 221662 counting only the distinct ones).

The product of its (nonzero) digits is 223948800, while the sum is 66.

The spelling of 21340595694864 in words is "twenty-one trillion, three hundred forty billion, five hundred ninety-five million, six hundred ninety-four thousand, eight hundred sixty-four".