121380811 has 2 divisors, whose sum is σ = 121380812. Its totient is φ = 121380810.

The previous prime is 121380773. The next prime is 121380827. The reversal of 121380811 is 118083121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121380811 - 2⁹ = 121380299 is a prime.

It is not a weakly prime, because it can be changed into another prime (121380851) 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, 60690405 + 60690406.

It is an arithmetic number, because the mean of its divisors is an integer number (60690406).

Almost surely, 2^121380811 is an apocalyptic number.

121380811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121380811 is an equidigital number, since it uses as much as digits as its factorization.

121380811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 121380811 is about 11017.2959931192. The cubic root of 121380811 is about 495.1270782123.

The spelling of 121380811 in words is "one hundred twenty-one million, three hundred eighty thousand, eight hundred eleven".