121112220110221 has 2 divisors, whose sum is σ = 121112220110222. Its totient is φ = 121112220110220.

The previous prime is 121112220110201. The next prime is 121112220110249. The reversal of 121112220110221 is 122011022211121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116378484348996 + 4733735761225 = 10787886^2 + 2175715^2 .

It is a cyclic number.

It is not a de Polignac number, because 121112220110221 - 2¹⁹ = 121112219585933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121112220110201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556110055110 + 60556110055111.

It is an arithmetic number, because the mean of its divisors is an integer number (60556110055111).

Almost surely, 2^{121112220110221} is an apocalyptic number.

It is an amenable number.

121112220110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121112220110221 is an equidigital number, since it uses as much as digits as its factorization.

121112220110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121112220110221 its reverse (122011022211121), we get a palindrome (243123242321342).

The spelling of 121112220110221 in words is "one hundred twenty-one trillion, one hundred twelve billion, two hundred twenty million, one hundred ten thousand, two hundred twenty-one".