12212031091 has 32 divisors (see below), whose sum is σ = 13535383680.
Its totient is φ = 11014473600.
The previous prime is 12212031077. The next prime is 12212031113. The reversal of 12212031091 is 19013021221.
It is not a de Polignac number, because 12212031091 - 25 = 12212031059 is a prime.
It is not an unprimeable number, because it can be changed into a prime (12212031191) by changing a digit.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39266826 + ... + 39267136.
It is an arithmetic number, because the mean of its divisors is an integer number (422980740).
Almost surely, 212212031091 is an apocalyptic number.
12212031091 is a deficient number, since it is larger than the sum of its proper divisors (1323352589).
12212031091 is an equidigital number, since it uses as much as digits as its factorization.
12212031091 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 704 (or 678 counting only the distinct ones).
The product of its (nonzero) digits is 216, while the sum is 22.
The spelling of 12212031091 in words is "twelve billion, two hundred twelve million, thirty-one thousand, ninety-one".