331220012111 has 2 divisors, whose sum is σ = 331220012112. Its totient is φ = 331220012110.

The previous prime is 331220012107. The next prime is 331220012117. The reversal of 331220012111 is 111210022133.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331220012111 - 2² = 331220012107 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 331220012111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331220012117) 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, 165610006055 + 165610006056.

It is an arithmetic number, because the mean of its divisors is an integer number (165610006056).

Almost surely, 2^331220012111 is an apocalyptic number.

331220012111 is a deficient number, since it is larger than the sum of its proper divisors (1).

331220012111 is an equidigital number, since it uses as much as digits as its factorization.

331220012111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 331220012111 its reverse (111210022133), we get a palindrome (442430034244).

The spelling of 331220012111 in words is "three hundred thirty-one billion, two hundred twenty million, twelve thousand, one hundred eleven".