1231203321 has 20 divisors (see below), whose sum is σ = 1869363364. Its totient is φ = 807343200.

The previous prime is 1231203313. The next prime is 1231203329. The reversal of 1231203321 is 1233021321.

It is an interprime number because it is at equal distance from previous prime (1231203313) and next prime (1231203329).

It can be written as a sum of positive squares in 2 ways, for example, as 504631296 + 726572025 = 22464^2 + 26955^2 .

It is not a de Polignac number, because 1231203321 - 2³ = 1231203313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231203294 and 1231203303.

It is not an unprimeable number, because it can be changed into a prime (1231203329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 119650 + ... + 129531.

Almost surely, 2^1231203321 is an apocalyptic number.

It is an amenable number.

1231203321 is a deficient number, since it is larger than the sum of its proper divisors (638160043).

1231203321 is an equidigital number, since it uses as much as digits as its factorization.

1231203321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249254 (or 249245 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1231203321 is about 35088.5069645318. The cubic root of 1231203321 is about 1071.7905562944.

Adding to 1231203321 its reverse (1233021321), we get a palindrome (2464224642).

The spelling of 1231203321 in words is "one billion, two hundred thirty-one million, two hundred three thousand, three hundred twenty-one".