203434121111 has 4 divisors (see below), whose sum is σ = 219082899672. Its totient is φ = 187785342552.

The previous prime is 203434121087. The next prime is 203434121161. The reversal of 203434121111 is 111121434302.

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 203434121111 - 2³⁴ = 186254251927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203434121161) 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, 7824389261 + ... + 7824389286.

It is an arithmetic number, because the mean of its divisors is an integer number (54770724918).

Almost surely, 2^203434121111 is an apocalyptic number.

203434121111 is a deficient number, since it is larger than the sum of its proper divisors (15648778561).

203434121111 is a wasteful number, since it uses less digits than its factorization.

203434121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15648778560.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 203434121111 its reverse (111121434302), we get a palindrome (314555555413).

The spelling of 203434121111 in words is "two hundred three billion, four hundred thirty-four million, one hundred twenty-one thousand, one hundred eleven".