121391099 has 2 divisors, whose sum is σ = 121391100. Its totient is φ = 121391098.

The previous prime is 121391093. The next prime is 121391111. The reversal of 121391099 is 990193121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121391099 is a prime.

It is not a weakly prime, because it can be changed into another prime (121391093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60695549 + 60695550.

It is an arithmetic number, because the mean of its divisors is an integer number (60695550).

Almost surely, 2^121391099 is an apocalyptic number.

121391099 is a deficient number, since it is larger than the sum of its proper divisors (1).

121391099 is an equidigital number, since it uses as much as digits as its factorization.

121391099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 121391099 is about 11017.7628854500. The cubic root of 121391099 is about 495.1410664845.

The spelling of 121391099 in words is "one hundred twenty-one million, three hundred ninety-one thousand, ninety-nine".