311132030221 has 2 divisors, whose sum is σ = 311132030222. Its totient is φ = 311132030220.

The previous prime is 311132030173. The next prime is 311132030243. The reversal of 311132030221 is 122030231113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 309619909225 + 1512120996 = 556435^2 + 38886^2 .

It is a cyclic number.

It is not a de Polignac number, because 311132030221 - 2¹⁷ = 311131899149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (311132060221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155566015110 + 155566015111.

It is an arithmetic number, because the mean of its divisors is an integer number (155566015111).

Almost surely, 2^311132030221 is an apocalyptic number.

It is an amenable number.

311132030221 is a deficient number, since it is larger than the sum of its proper divisors (1).

311132030221 is an equidigital number, since it uses as much as digits as its factorization.

311132030221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 311132030221 its reverse (122030231113), we get a palindrome (433162261334).

The spelling of 311132030221 in words is "three hundred eleven billion, one hundred thirty-two million, thirty thousand, two hundred twenty-one".