1321123203 has 12 divisors (see below), whose sum is σ = 1978966808.
Its totient is φ = 880748640.
The previous prime is 1321123183. The next prime is 1321123211. The reversal of 1321123203 is 3023211231.
It is not a de Polignac number, because 1321123203 - 25 = 1321123171 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1321123253) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2718118 + ... + 2718603.
Almost surely, 21321123203 is an apocalyptic number.
1321123203 is a deficient number, since it is larger than the sum of its proper divisors (657843605).
1321123203 is an frugal number, since it uses more digits than its factorization.
1321123203 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5436736 (or 5436724 counting only the distinct ones).
The product of its (nonzero) digits is 216, while the sum is 18.
The square root of 1321123203 is about 36347.2585348606.
The cubic root of 1321123203 is about 1097.2723612259.
Adding to 1321123203 its reverse (3023211231), we get a palindrome (4344334434).
It can be divided in two parts, 13 and 21123203, that added together give a square (21123216 = 45962).
The spelling of 1321123203 in words is "one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred three".