121840203 has 4 divisors (see below), whose sum is σ = 162453608. Its totient is φ = 81226800.

The previous prime is 121840193. The next prime is 121840211. The reversal of 121840203 is 302048121.

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

It is not a de Polignac number, because 121840203 - 2⁵ = 121840171 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 121840203.

It is not an unprimeable number, because it can be changed into a prime (121840253) 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, 20306698 + ... + 20306703.

It is an arithmetic number, because the mean of its divisors is an integer number (40613402).

Almost surely, 2^121840203 is an apocalyptic number.

121840203 is a deficient number, since it is larger than the sum of its proper divisors (40613405).

121840203 is an equidigital number, since it uses as much as digits as its factorization.

121840203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40613404.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 121840203 is about 11038.1249766435. The cubic root of 121840203 is about 495.7509304360.

Adding to 121840203 its reverse (302048121), we get a palindrome (423888324).

The spelling of 121840203 in words is "one hundred twenty-one million, eight hundred forty thousand, two hundred three".