12101220091 has 2 divisors, whose sum is σ = 12101220092. Its totient is φ = 12101220090.

The previous prime is 12101220073. The next prime is 12101220119. The reversal of 12101220091 is 19002210121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12101220091 - 2²⁷ = 11967002363 is a prime.

It is not a weakly prime, because it can be changed into another prime (12101220491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050610045 + 6050610046.

It is an arithmetic number, because the mean of its divisors is an integer number (6050610046).

Almost surely, 2^12101220091 is an apocalyptic number.

12101220091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101220091 is an equidigital number, since it uses as much as digits as its factorization.

12101220091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 12101220091 in words is "twelve billion, one hundred one million, two hundred twenty thousand, ninety-one".