111010211321221 has 2 divisors, whose sum is σ = 111010211321222. Its totient is φ = 111010211321220.

The previous prime is 111010211321197. The next prime is 111010211321227. The reversal of 111010211321221 is 122123112010111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107917400188900 + 3092811132321 = 10388330^2 + 1758639^2 .

It is a cyclic number.

It is not a de Polignac number, because 111010211321221 - 2⁹ = 111010211320709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111010211321227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55505105660610 + 55505105660611.

It is an arithmetic number, because the mean of its divisors is an integer number (55505105660611).

Almost surely, 2^{111010211321221} is an apocalyptic number.

It is an amenable number.

111010211321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111010211321221 is an equidigital number, since it uses as much as digits as its factorization.

111010211321221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 111010211321221 its reverse (122123112010111), we get a palindrome (233133323331332).

The spelling of 111010211321221 in words is "one hundred eleven trillion, ten billion, two hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".