121242443 has 4 divisors (see below), whose sum is σ = 138562800. Its totient is φ = 103922088.

The previous prime is 121242437. The next prime is 121242461. The reversal of 121242443 is 344242121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344242121 = 89 ⋅3867889.

It is a cyclic number.

It is not a de Polignac number, because 121242443 - 2⁴ = 121242427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121242943) 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, 8660168 + ... + 8660181.

It is an arithmetic number, because the mean of its divisors is an integer number (34640700).

Almost surely, 2^121242443 is an apocalyptic number.

121242443 is a deficient number, since it is larger than the sum of its proper divisors (17320357).

121242443 is an equidigital number, since it uses as much as digits as its factorization.

121242443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17320356.

The product of its digits is 1536, while the sum is 23.

The square root of 121242443 is about 11011.0146217322. The cubic root of 121242443 is about 494.9388667148.

Adding to 121242443 its reverse (344242121), we get a palindrome (465484564).

The spelling of 121242443 in words is "one hundred twenty-one million, two hundred forty-two thousand, four hundred forty-three".