121865803 has 2 divisors, whose sum is σ = 121865804. Its totient is φ = 121865802.

The previous prime is 121865773. The next prime is 121865813. The reversal of 121865803 is 308568121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121865803 is a prime.

It is not a weakly prime, because it can be changed into another prime (121865813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60932901 + 60932902.

It is an arithmetic number, because the mean of its divisors is an integer number (60932902).

Almost surely, 2^121865803 is an apocalyptic number.

121865803 is a deficient number, since it is larger than the sum of its proper divisors (1).

121865803 is an equidigital number, since it uses as much as digits as its factorization.

121865803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 121865803 is about 11039.2845329759. The cubic root of 121865803 is about 495.7856489573.

The spelling of 121865803 in words is "one hundred twenty-one million, eight hundred sixty-five thousand, eight hundred three".