203121310013 has 16 divisors (see below), whose sum is σ = 216758277120. Its totient is φ = 190015113600.

The previous prime is 203121309961. The next prime is 203121310019. The reversal of 203121310013 is 310013121302.

It is a cyclic number.

It is not a de Polignac number, because 203121310013 - 2⁶ = 203121309949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203121309973 and 203121310000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203121310019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594545 + ... + 871622.

It is an arithmetic number, because the mean of its divisors is an integer number (13547392320).

Almost surely, 2^203121310013 is an apocalyptic number.

It is an amenable number.

203121310013 is a deficient number, since it is larger than the sum of its proper divisors (13636967107).

203121310013 is a wasteful number, since it uses less digits than its factorization.

203121310013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466348.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 203121310013 its reverse (310013121302), we get a palindrome (513134431315).

The spelling of 203121310013 in words is "two hundred three billion, one hundred twenty-one million, three hundred ten thousand, thirteen".