203121143503 has 6 divisors (see below), whose sum is σ = 215772287696. Its totient is φ = 191172840672.

The previous prime is 203121143453. The next prime is 203121143507. The reversal of 203121143503 is 305341121302.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-203121143503 is a prime.

It is a super-2 number, since 2×203121143503² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203121143507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 351420375 + ... + 351420952.

Almost surely, 2^203121143503 is an apocalyptic number.

203121143503 is a deficient number, since it is larger than the sum of its proper divisors (12651144193).

203121143503 is an equidigital number, since it uses as much as digits as its factorization.

203121143503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702841361 (or 702841344 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 203121143503 its reverse (305341121302), we get a palindrome (508462264805).

The spelling of 203121143503 in words is "two hundred three billion, one hundred twenty-one million, one hundred forty-three thousand, five hundred three".