121121443 has 4 divisors (see below), whose sum is σ = 121254160. Its totient is φ = 120988728.

The previous prime is 121121431. The next prime is 121121467. The reversal of 121121443 is 344121121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121121443 - 2¹⁷ = 120990371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121121443.

It is not an unprimeable number, because it can be changed into a prime (121121543) 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 in 3 ways as a sum of consecutive naturals, for example, 64980 + ... + 66817.

It is an arithmetic number, because the mean of its divisors is an integer number (30313540).

Almost surely, 2^121121443 is an apocalyptic number.

121121443 is a deficient number, since it is larger than the sum of its proper divisors (132717).

121121443 is an equidigital number, since it uses as much as digits as its factorization.

121121443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132716.

The product of its digits is 192, while the sum is 19.

The square root of 121121443 is about 11005.5187519717. The cubic root of 121121443 is about 494.7741621909.

Adding to 121121443 its reverse (344121121), we get a palindrome (465242564).

The spelling of 121121443 in words is "one hundred twenty-one million, one hundred twenty-one thousand, four hundred forty-three".