21664075526300 has 72 divisors (see below), whose sum is σ = 49839650776944. Its totient is φ = 8145523491840.

The previous prime is 21664075526273. The next prime is 21664075526309. The reversal of 21664075526300 is 362557046612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21664075526309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6758399 + ... + 9434198.

It is an arithmetic number, because the mean of its divisors is an integer number (692217371902).

Almost surely, 2^{21664075526300} is an apocalyptic number.

21664075526300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21664075526300 is an abundant number, since it is smaller than the sum of its proper divisors (28175575250644).

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

21664075526300 is a wasteful number, since it uses less digits than its factorization.

21664075526300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16193415 (or 16193408 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 47.

The spelling of 21664075526300 in words is "twenty-one trillion, six hundred sixty-four billion, seventy-five million, five hundred twenty-six thousand, three hundred".