12664106221 has 8 divisors (see below), whose sum is σ = 13661275320. Its totient is φ = 11670223872.

The previous prime is 12664106197. The next prime is 12664106261. The reversal of 12664106221 is 12260146621.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 698809225 + 11965296996 = 26435^2 + 109386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12664106221 - 2⁷ = 12664106093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664106261) 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, 813676 + ... + 829093.

It is an arithmetic number, because the mean of its divisors is an integer number (1707659415).

Almost surely, 2^12664106221 is an apocalyptic number.

It is an amenable number.

12664106221 is a deficient number, since it is larger than the sum of its proper divisors (997169099).

12664106221 is a wasteful number, since it uses less digits than its factorization.

12664106221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643375.

The product of its (nonzero) digits is 6912, while the sum is 31.

The spelling of 12664106221 in words is "twelve billion, six hundred sixty-four million, one hundred six thousand, two hundred twenty-one".