221082444280121 has 2 divisors, whose sum is σ = 221082444280122. Its totient is φ = 221082444280120.

The previous prime is 221082444280081. The next prime is 221082444280147. The reversal of 221082444280121 is 121082444280122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158261935248400 + 62820509031721 = 12580220^2 + 7925939^2 .

It is a cyclic number.

It is not a de Polignac number, because 221082444280121 - 2³⁰ = 221081370538297 is a prime.

It is not a weakly prime, because it can be changed into another prime (221082444282121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110541222140060 + 110541222140061.

It is an arithmetic number, because the mean of its divisors is an integer number (110541222140061).

Almost surely, 2^{221082444280121} is an apocalyptic number.

It is an amenable number.

221082444280121 is a deficient number, since it is larger than the sum of its proper divisors (1).

221082444280121 is an equidigital number, since it uses as much as digits as its factorization.

221082444280121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131072, while the sum is 41.

Subtracting from 221082444280121 its reverse (121082444280122), we obtain a palindrome (99999999999999).

The spelling of 221082444280121 in words is "two hundred twenty-one trillion, eighty-two billion, four hundred forty-four million, two hundred eighty thousand, one hundred twenty-one".