121220243 has 2 divisors, whose sum is σ = 121220244. Its totient is φ = 121220242.

The previous prime is 121220213. The next prime is 121220269. The reversal of 121220243 is 342022121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121220243 - 2⁶ = 121220179 is a prime.

It is not a weakly prime, because it can be changed into another prime (121220213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610121 + 60610122.

It is an arithmetic number, because the mean of its divisors is an integer number (60610122).

Almost surely, 2^121220243 is an apocalyptic number.

121220243 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220243 is an equidigital number, since it uses as much as digits as its factorization.

121220243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 121220243 is about 11010.0064940944. The cubic root of 121220243 is about 494.9086564098.

Adding to 121220243 its reverse (342022121), we get a palindrome (463242364).

The spelling of 121220243 in words is "one hundred twenty-one million, two hundred twenty thousand, two hundred forty-three".