203021131321 has 4 divisors (see below), whose sum is σ = 203022148644. Its totient is φ = 203020114000.

The previous prime is 203021131297. The next prime is 203021131349. The reversal of 203021131321 is 123131120302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 180570604096 + 22450527225 = 424936^2 + 149835^2 .

It is a cyclic number.

It is not a de Polignac number, because 203021131321 - 2⁵ = 203021131289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203021137321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99730 + ... + 644971.

It is an arithmetic number, because the mean of its divisors is an integer number (50755537161).

Almost surely, 2^203021131321 is an apocalyptic number.

It is an amenable number.

203021131321 is a deficient number, since it is larger than the sum of its proper divisors (1017323).

203021131321 is an equidigital number, since it uses as much as digits as its factorization.

203021131321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017322.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 203021131321 its reverse (123131120302), we get a palindrome (326152251623).

The spelling of 203021131321 in words is "two hundred three billion, twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".