12221000291 has 2 divisors, whose sum is σ = 12221000292. Its totient is φ = 12221000290.

The previous prime is 12221000219. The next prime is 12221000293. The reversal of 12221000291 is 19200012221.

It is a happy number.

Together with previous prime (12221000219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12221000291 is a prime.

It is a super-2 number, since 2×12221000291² (a number of 21 digits) contains 22 as substring.

Together with 12221000293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12221000293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110500145 + 6110500146.

It is an arithmetic number, because the mean of its divisors is an integer number (6110500146).

Almost surely, 2^12221000291 is an apocalyptic number.

12221000291 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221000291 is an equidigital number, since it uses as much as digits as its factorization.

12221000291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 12221000291 in words is "twelve billion, two hundred twenty-one million, two hundred ninety-one", and thus it is an aban number.