203103312321 has 64 divisors (see below), whose sum is σ = 337342440960. Its totient is φ = 105833502720.

The previous prime is 203103312299. The next prime is 203103312341. The reversal of 203103312321 is 123213301302.

It is not a de Polignac number, because 203103312321 - 2¹⁴ = 203103295937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (203103312341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33551131 + ... + 33557183.

It is an arithmetic number, because the mean of its divisors is an integer number (5270975640).

Almost surely, 2^203103312321 is an apocalyptic number.

203103312321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

203103312321 is a deficient number, since it is larger than the sum of its proper divisors (134239128639).

203103312321 is a wasteful number, since it uses less digits than its factorization.

203103312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7546.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 203103312321 its reverse (123213301302), we get a palindrome (326316613623).

The spelling of 203103312321 in words is "two hundred three billion, one hundred three million, three hundred twelve thousand, three hundred twenty-one".