221413444321 has 4 divisors (see below), whose sum is σ = 225591056532. Its totient is φ = 217235832112.

The previous prime is 221413444279. The next prime is 221413444331. The reversal of 221413444321 is 123444314122.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123444314122 = 2 ⋅61722157061.

It can be written as a sum of positive squares in 2 ways, for example, as 120187022400 + 101226421921 = 346680^2 + 318161^2 .

It is a cyclic number.

It is not a de Polignac number, because 221413444321 - 2⁹ = 221413443809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221413444331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2088806026 + ... + 2088806131.

It is an arithmetic number, because the mean of its divisors is an integer number (56397764133).

Almost surely, 2^221413444321 is an apocalyptic number.

It is an amenable number.

221413444321 is a deficient number, since it is larger than the sum of its proper divisors (4177612211).

221413444321 is an equidigital number, since it uses as much as digits as its factorization.

221413444321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4177612210.

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

Adding to 221413444321 its reverse (123444314122), we get a palindrome (344857758443).

The spelling of 221413444321 in words is "two hundred twenty-one billion, four hundred thirteen million, four hundred forty-four thousand, three hundred twenty-one".