12111099971 has 2 divisors, whose sum is σ = 12111099972. Its totient is φ = 12111099970.

The previous prime is 12111099943. The next prime is 12111100039. The reversal of 12111099971 is 17999011121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12111099971 - 2²² = 12106905667 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (12111099911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055549985 + 6055549986.

It is an arithmetic number, because the mean of its divisors is an integer number (6055549986).

Almost surely, 2^12111099971 is an apocalyptic number.

12111099971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111099971 is an equidigital number, since it uses as much as digits as its factorization.

12111099971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 41.

The spelling of 12111099971 in words is "twelve billion, one hundred eleven million, ninety-nine thousand, nine hundred seventy-one".