21664466446612 has 24 divisors (see below), whose sum is σ = 42321283294752. Its totient is φ = 9618473474400.

The previous prime is 21664466446523. The next prime is 21664466446613.

21664466446612 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21664466446613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5725279939 + ... + 5725283722.

It is an arithmetic number, because the mean of its divisors is an integer number (1763386803948).

Almost surely, 2^{21664466446612} is an apocalyptic number.

21664466446612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21664466446612 is a deficient number, since it is larger than the sum of its proper divisors (20656816848140).

21664466446612 is a wasteful number, since it uses less digits than its factorization.

21664466446612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11450563719 (or 11450563717 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 58.

The spelling of 21664466446612 in words is "twenty-one trillion, six hundred sixty-four billion, four hundred sixty-six million, four hundred forty-six thousand, six hundred twelve".