121111100000221 has 2 divisors, whose sum is σ = 121111100000222. Its totient is φ = 121111100000220.

The previous prime is 121111100000203. The next prime is 121111100000239. The reversal of 121111100000221 is 122000001111121.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (121111100000203) and next prime (121111100000239).

It can be written as a sum of positive squares in only one way, i.e., 94743183099321 + 26367916900900 = 9733611^2 + 5134970^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111100000221 - 2⁹ = 121111099999709 is a prime.

It is a super-2 number, since 2×121111100000221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121111100000291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555550000110 + 60555550000111.

It is an arithmetic number, because the mean of its divisors is an integer number (60555550000111).

Almost surely, 2^{121111100000221} is an apocalyptic number.

It is an amenable number.

121111100000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121111100000221 is an equidigital number, since it uses as much as digits as its factorization.

121111100000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121111100000221 its reverse (122000001111121), we get a palindrome (243111101111342).

The spelling of 121111100000221 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred million, two hundred twenty-one", and thus it is an aban number.