12266666221 has 16 divisors (see below), whose sum is σ = 12712992768. Its totient is φ = 11828073600.

The previous prime is 12266666219. The next prime is 12266666227.

12266666221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 12266666221 - 2¹ = 12266666219 is a prime.

It is a super-3 number, since 3×12266666221³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12266666227) 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, 1406751 + ... + 1415443.

It is an arithmetic number, because the mean of its divisors is an integer number (794562048).

Almost surely, 2^12266666221 is an apocalyptic number.

It is an amenable number.

12266666221 is a deficient number, since it is larger than the sum of its proper divisors (446326547).

12266666221 is a wasteful number, since it uses less digits than its factorization.

12266666221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9132.

The product of its digits is 124416, while the sum is 40.

The spelling of 12266666221 in words is "twelve billion, two hundred sixty-six million, six hundred sixty-six thousand, two hundred twenty-one".