331111100012221 has 2 divisors, whose sum is σ = 331111100012222. Its totient is φ = 331111100012220.

The previous prime is 331111100012207. The next prime is 331111100012233. The reversal of 331111100012221 is 122210001111133.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305693228287225 + 25417871724996 = 17484085^2 + 5041614^2 .

It is a cyclic number.

It is not a de Polignac number, because 331111100012221 - 2⁷ = 331111100012093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331111100012321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165555550006110 + 165555550006111.

It is an arithmetic number, because the mean of its divisors is an integer number (165555550006111).

Almost surely, 2^{331111100012221} is an apocalyptic number.

It is an amenable number.

331111100012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

331111100012221 is an equidigital number, since it uses as much as digits as its factorization.

331111100012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 331111100012221 its reverse (122210001111133), we get a palindrome (453321101123354).

The spelling of 331111100012221 in words is "three hundred thirty-one trillion, one hundred eleven billion, one hundred million, twelve thousand, two hundred twenty-one".