121204243 has 4 divisors (see below), whose sum is σ = 121254520. Its totient is φ = 121153968.

The previous prime is 121204219. The next prime is 121204261. The reversal of 121204243 is 342402121.

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 121204243 - 2¹⁷ = 121073171 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 121204243.

It is not an unprimeable number, because it can be changed into a prime (121204283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21330 + ... + 26407.

It is an arithmetic number, because the mean of its divisors is an integer number (30313630).

Almost surely, 2^121204243 is an apocalyptic number.

121204243 is a deficient number, since it is larger than the sum of its proper divisors (50277).

121204243 is an equidigital number, since it uses as much as digits as its factorization.

121204243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50276.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 121204243 is about 11009.2798583740. The cubic root of 121204243 is about 494.8868809298.

Adding to 121204243 its reverse (342402121), we get a palindrome (463606364).

The spelling of 121204243 in words is "one hundred twenty-one million, two hundred four thousand, two hundred forty-three".