121218871 has 2 divisors, whose sum is σ = 121218872. Its totient is φ = 121218870.

The previous prime is 121218767. The next prime is 121218899. The reversal of 121218871 is 178812121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121218871 - 2⁹ = 121218359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121218971) 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, 60609435 + 60609436.

It is an arithmetic number, because the mean of its divisors is an integer number (60609436).

Almost surely, 2^121218871 is an apocalyptic number.

121218871 is a deficient number, since it is larger than the sum of its proper divisors (1).

121218871 is an equidigital number, since it uses as much as digits as its factorization.

121218871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 31.

The square root of 121218871 is about 11009.9441869612. The cubic root of 121218871 is about 494.9067892375.

The spelling of 121218871 in words is "one hundred twenty-one million, two hundred eighteen thousand, eight hundred seventy-one".