1442444221 has 2 divisors, whose sum is σ = 1442444222. Its totient is φ = 1442444220.

The previous prime is 1442444219. The next prime is 1442444231. The reversal of 1442444221 is 1224442441.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079122500 + 363321721 = 32850^2 + 19061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1442444221 - 2¹ = 1442444219 is a prime.

Together with 1442444219, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1442444221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1442444231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 721222110 + 721222111.

It is an arithmetic number, because the mean of its divisors is an integer number (721222111).

Almost surely, 2^1442444221 is an apocalyptic number.

It is an amenable number.

1442444221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1442444221 is an equidigital number, since it uses as much as digits as its factorization.

1442444221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8192, while the sum is 28.

The square root of 1442444221 is about 37979.5237068608. The cubic root of 1442444221 is about 1129.8817901771.

Adding to 1442444221 its reverse (1224442441), we get a palindrome (2666886662).

The spelling of 1442444221 in words is "one billion, four hundred forty-two million, four hundred forty-four thousand, two hundred twenty-one".