31132222321 has 2 divisors, whose sum is σ = 31132222322. Its totient is φ = 31132222320.

The previous prime is 31132222283. The next prime is 31132222337. The reversal of 31132222321 is 12322223113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27188382321 + 3943840000 = 164889^2 + 62800^2 .

It is a cyclic number.

It is not a de Polignac number, because 31132222321 - 2⁷ = 31132222193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31132222292 and 31132222301.

It is not a weakly prime, because it can be changed into another prime (31132222021) 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 as a sum of consecutive naturals, namely, 15566111160 + 15566111161.

It is an arithmetic number, because the mean of its divisors is an integer number (15566111161).

Almost surely, 2^31132222321 is an apocalyptic number.

It is an amenable number.

31132222321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31132222321 is an equidigital number, since it uses as much as digits as its factorization.

31132222321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

Adding to 31132222321 its reverse (12322223113), we get a palindrome (43454445434).

The spelling of 31132222321 in words is "thirty-one billion, one hundred thirty-two million, two hundred twenty-two thousand, three hundred twenty-one".