221222322401 has 2 divisors, whose sum is σ = 221222322402. Its totient is φ = 221222322400.

The previous prime is 221222322383. The next prime is 221222322421. The reversal of 221222322401 is 104223222122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144962947600 + 76259374801 = 380740^2 + 276151^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222322401 - 2²⁶ = 221155213537 is a prime.

It is not a weakly prime, because it can be changed into another prime (221222322421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611161200 + 110611161201.

It is an arithmetic number, because the mean of its divisors is an integer number (110611161201).

Almost surely, 2^221222322401 is an apocalyptic number.

It is an amenable number.

221222322401 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222322401 is an equidigital number, since it uses as much as digits as its factorization.

221222322401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221222322401 its reverse (104223222122), we get a palindrome (325445544523).

The spelling of 221222322401 in words is "two hundred twenty-one billion, two hundred twenty-two million, three hundred twenty-two thousand, four hundred one".