12266644666221 has 16 divisors (see below), whose sum is σ = 19824880269120. Its totient is φ = 7434330100560.

The previous prime is 12266644666189. The next prime is 12266644666247.

12266644666221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12266644666221 - 2⁵ = 12266644666189 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12266644666291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20650916650 + ... + 20650917243.

It is an arithmetic number, because the mean of its divisors is an integer number (1239055016820).

Almost surely, 2^{12266644666221} is an apocalyptic number.

12266644666221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12266644666221 is a deficient number, since it is larger than the sum of its proper divisors (7558235602899).

12266644666221 is a wasteful number, since it uses less digits than its factorization.

12266644666221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41301833913 (or 41301833907 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 54.

The spelling of 12266644666221 in words is "twelve trillion, two hundred sixty-six billion, six hundred forty-four million, six hundred sixty-six thousand, two hundred twenty-one".