12102102091 has 4 divisors (see below), whose sum is σ = 12102323400. Its totient is φ = 12101880784.

The previous prime is 12102102071. The next prime is 12102102101. The reversal of 12102102091 is 19020120121.

It is a happy number.

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 12102102091 - 2²⁷ = 11967884363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12102102071) 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, 37440 + ... + 160018.

It is an arithmetic number, because the mean of its divisors is an integer number (3025580850).

Almost surely, 2^12102102091 is an apocalyptic number.

12102102091 is a deficient number, since it is larger than the sum of its proper divisors (221309).

12102102091 is an equidigital number, since it uses as much as digits as its factorization.

12102102091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221308.

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

The spelling of 12102102091 in words is "twelve billion, one hundred two million, one hundred two thousand, ninety-one".