12221091 has 8 divisors (see below), whose sum is σ = 18105360. Its totient is φ = 8147376.

The previous prime is 12221089. The next prime is 12221107. The reversal of 12221091 is 19012221.

It is not a de Polignac number, because 12221091 - 2¹ = 12221089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12221021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226290 + ... + 226343.

It is an arithmetic number, because the mean of its divisors is an integer number (2263170).

Almost surely, 2^12221091 is an apocalyptic number.

12221091 is a deficient number, since it is larger than the sum of its proper divisors (5884269).

12221091 is an equidigital number, since it uses as much as digits as its factorization.

12221091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452642 (or 452636 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 12221091 is about 3495.8677034465. The cubic root of 12221091 is about 230.3403342135.

The spelling of 12221091 in words is "twelve million, two hundred twenty-one thousand, ninety-one".