21664106120 has 32 divisors (see below), whose sum is σ = 48748504320. Its totient is φ = 8664884160.

The previous prime is 21664106117. The next prime is 21664106129. The reversal of 21664106120 is 2160146612.

It is not an unprimeable number, because it can be changed into a prime (21664106129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 755159 + ... + 783321.

It is an arithmetic number, because the mean of its divisors is an integer number (1523390760).

Almost surely, 2^21664106120 is an apocalyptic number.

21664106120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21664106120 is an abundant number, since it is smaller than the sum of its proper divisors (27084398200).

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

21664106120 is a wasteful number, since it uses less digits than its factorization.

21664106120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47405 (or 47401 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21664106120 in words is "twenty-one billion, six hundred sixty-four million, one hundred six thousand, one hundred twenty".