21666322366612 has 24 divisors (see below), whose sum is σ = 47271976073280. Its totient is φ = 8441424298560.

The previous prime is 21666322366499. The next prime is 21666322366639.

21666322366612 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21666322366612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35172600937 + ... + 35172601552.

It is an arithmetic number, because the mean of its divisors is an integer number (1969665669720).

Almost surely, 2^{21666322366612} is an apocalyptic number.

21666322366612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21666322366612 is an abundant number, since it is smaller than the sum of its proper divisors (25605653706668).

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

21666322366612 is a wasteful number, since it uses less digits than its factorization.

21666322366612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70345202511 (or 70345202509 counting only the distinct ones).

The product of its digits is 6718464, while the sum is 52.

The spelling of 21666322366612 in words is "twenty-one trillion, six hundred sixty-six billion, three hundred twenty-two million, three hundred sixty-six thousand, six hundred twelve".