12220191 has 12 divisors (see below), whose sum is σ = 17941560. Its totient is φ = 8012880.

The previous prime is 12220183. The next prime is 12220193. The reversal of 12220191 is 19102221.

It is not a de Polignac number, because 12220191 - 2³ = 12220183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10581 + ... + 11678.

It is an arithmetic number, because the mean of its divisors is an integer number (1495130).

Almost surely, 2^12220191 is an apocalyptic number.

12220191 is a deficient number, since it is larger than the sum of its proper divisors (5721369).

12220191 is a wasteful number, since it uses less digits than its factorization.

12220191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22326 (or 22323 counting only the distinct ones).

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

The square root of 12220191 is about 3495.7389776698. The cubic root of 12220191 is about 230.3346797432.

The spelling of 12220191 in words is "twelve million, two hundred twenty thousand, one hundred ninety-one".