21664652611404 has 96 divisors (see below), whose sum is σ = 55788932731392. Its totient is φ = 6488778240000.

The previous prime is 21664652611403. The next prime is 21664652611477. The reversal of 21664652611404 is 40411625646612.

It is not an unprimeable number, because it can be changed into a prime (21664652611403) 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 31 ways as a sum of consecutive naturals, for example, 6284409 + ... + 9100719.

It is an arithmetic number, because the mean of its divisors is an integer number (581134715952).

Almost surely, 2^{21664652611404} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21664652611404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27894466365696).

21664652611404 is an abundant number, since it is smaller than the sum of its proper divisors (34124280119988).

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

21664652611404 is a wasteful number, since it uses less digits than its factorization.

21664652611404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817007 (or 2817005 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 48.

The spelling of 21664652611404 in words is "twenty-one trillion, six hundred sixty-four billion, six hundred fifty-two million, six hundred eleven thousand, four hundred four".