31233130321 has 4 divisors (see below), whose sum is σ = 31285800612. Its totient is φ = 31180460032.

The previous prime is 31233130277. The next prime is 31233130387. The reversal of 31233130321 is 12303133213.

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 12975715921 + 18257414400 = 113911^2 + 135120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31233130321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31233130292 and 31233130301.

It is not an unprimeable number, because it can be changed into a prime (31233130021) 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, 26334256 + ... + 26335441.

It is an arithmetic number, because the mean of its divisors is an integer number (7821450153).

Almost surely, 2^31233130321 is an apocalyptic number.

It is an amenable number.

31233130321 is a deficient number, since it is larger than the sum of its proper divisors (52670291).

31233130321 is an equidigital number, since it uses as much as digits as its factorization.

31233130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52670290.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31233130321 its reverse (12303133213), we get a palindrome (43536263534).

The spelling of 31233130321 in words is "thirty-one billion, two hundred thirty-three million, one hundred thirty thousand, three hundred twenty-one".