111221011222091 has 2 divisors, whose sum is σ = 111221011222092. Its totient is φ = 111221011222090.

The previous prime is 111221011222007. The next prime is 111221011222133. The reversal of 111221011222091 is 190222110122111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221011222091 is a prime.

It is a super-2 number, since 2×111221011222091² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111221011222091.

It is not a weakly prime, because it can be changed into another prime (111221011222891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610505611045 + 55610505611046.

It is an arithmetic number, because the mean of its divisors is an integer number (55610505611046).

Almost surely, 2^{111221011222091} is an apocalyptic number.

111221011222091 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221011222091 is an equidigital number, since it uses as much as digits as its factorization.

111221011222091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 111221011222091 in words is "one hundred eleven trillion, two hundred twenty-one billion, eleven million, two hundred twenty-two thousand, ninety-one".