121100221091 has 2 divisors, whose sum is σ = 121100221092. Its totient is φ = 121100221090.

The previous prime is 121100221087. The next prime is 121100221141. The reversal of 121100221091 is 190122001121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121100221091 - 2² = 121100221087 is a prime.

It is not a weakly prime, because it can be changed into another prime (121100221691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550110545 + 60550110546.

It is an arithmetic number, because the mean of its divisors is an integer number (60550110546).

Almost surely, 2^121100221091 is an apocalyptic number.

121100221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100221091 is an equidigital number, since it uses as much as digits as its factorization.

121100221091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121100221091 in words is "one hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, ninety-one".