121543203 has 4 divisors (see below), whose sum is σ = 162057608. Its totient is φ = 81028800.

The previous prime is 121543199. The next prime is 121543207. The reversal of 121543203 is 302345121.

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

It is an interprime number because it is at equal distance from previous prime (121543199) and next prime (121543207).

It is not a de Polignac number, because 121543203 - 2² = 121543199 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 121543203.

It is not an unprimeable number, because it can be changed into a prime (121543207) 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, 20257198 + ... + 20257203.

It is an arithmetic number, because the mean of its divisors is an integer number (40514402).

Almost surely, 2^121543203 is an apocalyptic number.

121543203 is a deficient number, since it is larger than the sum of its proper divisors (40514405).

121543203 is an equidigital number, since it uses as much as digits as its factorization.

121543203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40514404.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 121543203 is about 11024.6633962221. The cubic root of 121543203 is about 495.3477853828.

Adding to 121543203 its reverse (302345121), we get a palindrome (423888324).

The spelling of 121543203 in words is "one hundred twenty-one million, five hundred forty-three thousand, two hundred three".