12121663211 has 4 divisors (see below), whose sum is σ = 13853329392. Its totient is φ = 10389997032.

The previous prime is 12121663193. The next prime is 12121663219. The reversal of 12121663211 is 11236612121.

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

It is a cyclic number.

It is not a de Polignac number, because 12121663211 - 2¹⁰ = 12121662187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121663219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865833080 + ... + 865833093.

It is an arithmetic number, because the mean of its divisors is an integer number (3463332348).

Almost surely, 2^12121663211 is an apocalyptic number.

12121663211 is a deficient number, since it is larger than the sum of its proper divisors (1731666181).

12121663211 is an equidigital number, since it uses as much as digits as its factorization.

12121663211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731666180.

The product of its digits is 864, while the sum is 26.

The spelling of 12121663211 in words is "twelve billion, one hundred twenty-one million, six hundred sixty-three thousand, two hundred eleven".