203112100321 has 4 divisors (see below), whose sum is σ = 218736108052. Its totient is φ = 187488092592.

The previous prime is 203112100307. The next prime is 203112100327. The reversal of 203112100321 is 123001211302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64049486400 + 139062613921 = 253080^2 + 372911^2 .

It is a cyclic number.

It is not a de Polignac number, because 203112100321 - 2¹³ = 203112092129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203112100295 and 203112100304.

It is not an unprimeable number, because it can be changed into a prime (203112100327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7812003846 + ... + 7812003871.

It is an arithmetic number, because the mean of its divisors is an integer number (54684027013).

Almost surely, 2^203112100321 is an apocalyptic number.

It is an amenable number.

203112100321 is a deficient number, since it is larger than the sum of its proper divisors (15624007731).

203112100321 is a wasteful number, since it uses less digits than its factorization.

203112100321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15624007730.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 203112100321 its reverse (123001211302), we get a palindrome (326113311623).

The spelling of 203112100321 in words is "two hundred three billion, one hundred twelve million, one hundred thousand, three hundred twenty-one".