203303131921 has 2 divisors, whose sum is σ = 203303131922. Its totient is φ = 203303131920.

The previous prime is 203303131919. The next prime is 203303131939. The reversal of 203303131921 is 129131303302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149683098321 + 53620033600 = 386889^2 + 231560^2 .

It is a cyclic number.

It is not a de Polignac number, because 203303131921 - 2¹ = 203303131919 is a prime.

Together with 203303131919, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 203303131921.

It is not a weakly prime, because it can be changed into another prime (203303131981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101651565960 + 101651565961.

It is an arithmetic number, because the mean of its divisors is an integer number (101651565961).

Almost surely, 2^203303131921 is an apocalyptic number.

It is an amenable number.

203303131921 is a deficient number, since it is larger than the sum of its proper divisors (1).

203303131921 is an equidigital number, since it uses as much as digits as its factorization.

203303131921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 203303131921 in words is "two hundred three billion, three hundred three million, one hundred thirty-one thousand, nine hundred twenty-one".