13121336266 has 4 divisors (see below), whose sum is σ = 19682004402. Its totient is φ = 6560668132.

The previous prime is 13121336257. The next prime is 13121336281. The reversal of 13121336266 is 66263312131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8162219025 + 4959117241 = 90345^2 + 70421^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3280334065 + ... + 3280334068.

Almost surely, 2^13121336266 is an apocalyptic number.

13121336266 is a deficient number, since it is larger than the sum of its proper divisors (6560668136).

13121336266 is an equidigital number, since it uses as much as digits as its factorization.

13121336266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560668135.

The product of its digits is 23328, while the sum is 34.

Adding to 13121336266 its reverse (66263312131), we get a palindrome (79384648397).

The spelling of 13121336266 in words is "thirteen billion, one hundred twenty-one million, three hundred thirty-six thousand, two hundred sixty-six".