12621242166 has 32 divisors (see below), whose sum is σ = 27272813568. Its totient is φ = 3870802080.

The previous prime is 12621242159. The next prime is 12621242167. The reversal of 12621242166 is 66124212621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621242167) 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, 239590 + ... + 287481.

It is an arithmetic number, because the mean of its divisors is an integer number (852275424).

Almost surely, 2^12621242166 is an apocalyptic number.

12621242166 is an abundant number, since it is smaller than the sum of its proper divisors (14651571402).

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

12621242166 is a wasteful number, since it uses less digits than its factorization.

12621242166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527396.

The product of its digits is 13824, while the sum is 33.

Adding to 12621242166 its reverse (66124212621), we get a palindrome (78745454787).

The spelling of 12621242166 in words is "twelve billion, six hundred twenty-one million, two hundred forty-two thousand, one hundred sixty-six".