203121204444431 has 16 divisors (see below), whose sum is σ = 250184862681600. Its totient is φ = 160589439265248.

The previous prime is 203121204444427. The next prime is 203121204444451. The reversal of 203121204444431 is 134444402121302.

It is not a de Polignac number, because 203121204444431 - 2² = 203121204444427 is a prime.

It is a super-2 number, since 2×203121204444431² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 203121204444391 and 203121204444400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203121204444401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 846013841 + ... + 846253898.

It is an arithmetic number, because the mean of its divisors is an integer number (15636553917600).

Almost surely, 2^{203121204444431} is an apocalyptic number.

203121204444431 is a deficient number, since it is larger than the sum of its proper divisors (47063658237169).

203121204444431 is a wasteful number, since it uses less digits than its factorization.

203121204444431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692269078.

The product of its (nonzero) digits is 73728, while the sum is 35.

Adding to 203121204444431 its reverse (134444402121302), we get a palindrome (337565606565733).

The spelling of 203121204444431 in words is "two hundred three trillion, one hundred twenty-one billion, two hundred four million, four hundred forty-four thousand, four hundred thirty-one".