12201210091 has 4 divisors (see below), whose sum is σ = 13944240112. Its totient is φ = 10458180072.

The previous prime is 12201210079. The next prime is 12201210103. The reversal of 12201210091 is 19001210221.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (12201210079) and next prime (12201210103).

It is a cyclic number.

It is not a de Polignac number, because 12201210091 - 2¹¹ = 12201208043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12201210001) 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, 871515000 + ... + 871515013.

It is an arithmetic number, because the mean of its divisors is an integer number (3486060028).

Almost surely, 2^12201210091 is an apocalyptic number.

12201210091 is a deficient number, since it is larger than the sum of its proper divisors (1743030021).

12201210091 is an equidigital number, since it uses as much as digits as its factorization.

12201210091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743030020.

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

The spelling of 12201210091 in words is "twelve billion, two hundred one million, two hundred ten thousand, ninety-one".