121803811 has 2 divisors, whose sum is σ = 121803812. Its totient is φ = 121803810.

The previous prime is 121803797. The next prime is 121803817. The reversal of 121803811 is 118308121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121803811 - 2¹⁷ = 121672739 is a prime.

It is not a weakly prime, because it can be changed into another prime (121803817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60901905 + 60901906.

It is an arithmetic number, because the mean of its divisors is an integer number (60901906).

Almost surely, 2^121803811 is an apocalyptic number.

121803811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121803811 is an equidigital number, since it uses as much as digits as its factorization.

121803811 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 121803811 is about 11036.4763851512. The cubic root of 121803811 is about 495.7015675165.

The spelling of 121803811 in words is "one hundred twenty-one million, eight hundred three thousand, eight hundred eleven".