1142444221 has 4 divisors (see below), whose sum is σ = 1143747772. Its totient is φ = 1141140672.

The previous prime is 1142444159. The next prime is 1142444231. The reversal of 1142444221 is 1224442411.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 866419225 + 276024996 = 29435^2 + 16614^2 .

It is a cyclic number.

It is not a de Polignac number, because 1142444221 - 2¹¹ = 1142442173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1142444231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650460 + ... + 652213.

It is an arithmetic number, because the mean of its divisors is an integer number (285936943).

Almost surely, 2^1142444221 is an apocalyptic number.

It is an amenable number.

1142444221 is a deficient number, since it is larger than the sum of its proper divisors (1303551).

1142444221 is an equidigital number, since it uses as much as digits as its factorization.

1142444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303550.

The product of its digits is 2048, while the sum is 25.

The square root of 1142444221 is about 33800.0624407707. The cubic root of 1142444221 is about 1045.3899847057.

Adding to 1142444221 its reverse (1224442411), we get a palindrome (2366886632).

The spelling of 1142444221 in words is "one billion, one hundred forty-two million, four hundred forty-four thousand, two hundred twenty-one".