121381811 has 2 divisors, whose sum is σ = 121381812. Its totient is φ = 121381810.

The previous prime is 121381789. The next prime is 121381829. The reversal of 121381811 is 118183121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121381811 - 2¹⁴ = 121365427 is a prime.

It is not a weakly prime, because it can be changed into another prime (121381831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60690905 + 60690906.

It is an arithmetic number, because the mean of its divisors is an integer number (60690906).

Almost surely, 2^121381811 is an apocalyptic number.

121381811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121381811 is an equidigital number, since it uses as much as digits as its factorization.

121381811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 26.

The square root of 121381811 is about 11017.3413762123. The cubic root of 121381811 is about 495.1284379157.

The spelling of 121381811 in words is "one hundred twenty-one million, three hundred eighty-one thousand, eight hundred eleven".