121220443 has 2 divisors, whose sum is σ = 121220444. Its totient is φ = 121220442.

The previous prime is 121220441. The next prime is 121220453. The reversal of 121220443 is 344022121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121220443 - 2¹ = 121220441 is a prime.

It is a super-2 number, since 2×121220443² = 29388791602232498, which contains 22 as substring.

Together with 121220441, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 121220443.

It is not a weakly prime, because it can be changed into another prime (121220441) 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, 60610221 + 60610222.

It is an arithmetic number, because the mean of its divisors is an integer number (60610222).

Almost surely, 2^121220443 is an apocalyptic number.

121220443 is a deficient number, since it is larger than the sum of its proper divisors (1).

121220443 is an equidigital number, since it uses as much as digits as its factorization.

121220443 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 19.

The square root of 121220443 is about 11010.0155767374. The cubic root of 121220443 is about 494.9089285912.

Adding to 121220443 its reverse (344022121), we get a palindrome (465242564).

The spelling of 121220443 in words is "one hundred twenty-one million, two hundred twenty thousand, four hundred forty-three".