12121111291 has 2 divisors, whose sum is σ = 12121111292. Its totient is φ = 12121111290.

The previous prime is 12121111279. The next prime is 12121111307. The reversal of 12121111291 is 19211112121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12121111291 - 2⁹ = 12121110779 is a prime.

It is not a weakly prime, because it can be changed into another prime (12121111091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060555645 + 6060555646.

It is an arithmetic number, because the mean of its divisors is an integer number (6060555646).

Almost surely, 2^12121111291 is an apocalyptic number.

12121111291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121111291 is an equidigital number, since it uses as much as digits as its factorization.

12121111291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 22.

The spelling of 12121111291 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, two hundred ninety-one".