12221197 has 2 divisors, whose sum is σ = 12221198. Its totient is φ = 12221196.

The previous prime is 12221191. The next prime is 12221203. The reversal of 12221197 is 79112221.

It is a balanced prime because it is at equal distance from previous prime (12221191) and next prime (12221203).

It can be written as a sum of positive squares in only one way, i.e., 9616201 + 2604996 = 3101^2 + 1614^2 .

It is an emirp because it is prime and its reverse (79112221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221197 is a prime.

It is a super-2 number, since 2×12221197² = 298715312225618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12221191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110598 + 6110599.

It is an arithmetic number, because the mean of its divisors is an integer number (6110599).

Almost surely, 2^12221197 is an apocalyptic number.

It is an amenable number.

12221197 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221197 is an equidigital number, since it uses as much as digits as its factorization.

12221197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 504, while the sum is 25.

The square root of 12221197 is about 3495.8828641704. The cubic root of 12221197 is about 230.3410001662.

The spelling of 12221197 in words is "twelve million, two hundred twenty-one thousand, one hundred ninety-seven".