12221658091 has 2 divisors, whose sum is σ = 12221658092. Its totient is φ = 12221658090.

The previous prime is 12221658017. The next prime is 12221658109. The reversal of 12221658091 is 19085612221.

Together with next prime (12221658109) 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 not a de Polignac number, because 12221658091 - 2⁷ = 12221657963 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12221658091.

It is not a weakly prime, because it can be changed into another prime (12221658791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110829045 + 6110829046.

It is an arithmetic number, because the mean of its divisors is an integer number (6110829046).

Almost surely, 2^12221658091 is an apocalyptic number.

12221658091 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221658091 is an equidigital number, since it uses as much as digits as its factorization.

12221658091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 12221658091 in words is "twelve billion, two hundred twenty-one million, six hundred fifty-eight thousand, ninety-one".