12212100091 has 4 divisors (see below), whose sum is σ = 12213806472. Its totient is φ = 12210393712.

The previous prime is 12212100077. The next prime is 12212100097. The reversal of 12212100091 is 19000121221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19000121221 = 23 ⋅826092227.

It is a cyclic number.

It is not a de Polignac number, because 12212100091 - 2⁹ = 12212099579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212100097) 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, 842410 + ... + 856783.

It is an arithmetic number, because the mean of its divisors is an integer number (3053451618).

Almost surely, 2^12212100091 is an apocalyptic number.

12212100091 is a deficient number, since it is larger than the sum of its proper divisors (1706381).

12212100091 is an equidigital number, since it uses as much as digits as its factorization.

12212100091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706380.

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

The spelling of 12212100091 in words is "twelve billion, two hundred twelve million, one hundred thousand, ninety-one".