221144201321 has 2 divisors, whose sum is σ = 221144201322. Its totient is φ = 221144201320.

The previous prime is 221144201297. The next prime is 221144201381. The reversal of 221144201321 is 123102441122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201708774400 + 19435426921 = 449120^2 + 139411^2 .

It is a cyclic number.

It is not a de Polignac number, because 221144201321 - 2²² = 221140007017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221144201381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110572100660 + 110572100661.

It is an arithmetic number, because the mean of its divisors is an integer number (110572100661).

Almost surely, 2^221144201321 is an apocalyptic number.

It is an amenable number.

221144201321 is a deficient number, since it is larger than the sum of its proper divisors (1).

221144201321 is an equidigital number, since it uses as much as digits as its factorization.

221144201321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221144201321 its reverse (123102441122), we get a palindrome (344246642443).

The spelling of 221144201321 in words is "two hundred twenty-one billion, one hundred forty-four million, two hundred one thousand, three hundred twenty-one".