121100212091 has 2 divisors, whose sum is σ = 121100212092. Its totient is φ = 121100212090.

The previous prime is 121100212063. The next prime is 121100212117. The reversal of 121100212091 is 190212001121.

It is a strong prime.

It is an emirp because it is prime and its reverse (190212001121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121100212091 is a prime.

It is a super-2 number, since 2×121100212091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121100212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550106045 + 60550106046.

It is an arithmetic number, because the mean of its divisors is an integer number (60550106046).

Almost surely, 2^121100212091 is an apocalyptic number.

121100212091 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100212091 is an equidigital number, since it uses as much as digits as its factorization.

121100212091 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 121100212091 in words is "one hundred twenty-one billion, one hundred million, two hundred twelve thousand, ninety-one".