221306224441 has 2 divisors, whose sum is σ = 221306224442. Its totient is φ = 221306224440.

The previous prime is 221306224439. The next prime is 221306224471. The reversal of 221306224441 is 144422603122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219211240000 + 2094984441 = 468200^2 + 45771^2 .

It is a cyclic number.

It is not a de Polignac number, because 221306224441 - 2¹ = 221306224439 is a prime.

Together with 221306224439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221306224471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110653112220 + 110653112221.

It is an arithmetic number, because the mean of its divisors is an integer number (110653112221).

Almost surely, 2^221306224441 is an apocalyptic number.

It is an amenable number.

221306224441 is a deficient number, since it is larger than the sum of its proper divisors (1).

221306224441 is an equidigital number, since it uses as much as digits as its factorization.

221306224441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 221306224441 its reverse (144422603122), we get a palindrome (365728827563).

The spelling of 221306224441 in words is "two hundred twenty-one billion, three hundred six million, two hundred twenty-four thousand, four hundred forty-one".