2144430221 has 4 divisors (see below), whose sum is σ = 2144753244. Its totient is φ = 2144107200.

The previous prime is 2144430199. The next prime is 2144430229. The reversal of 2144430221 is 1220344412.

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 794676100 + 1349754121 = 28190^2 + 36739^2 .

It is a cyclic number.

It is not a de Polignac number, because 2144430221 - 2⁶ = 2144430157 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 (2144430229) 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, 151340 + ... + 164901.

It is an arithmetic number, because the mean of its divisors is an integer number (536188311).

Almost surely, 2^2144430221 is an apocalyptic number.

It is an amenable number.

2144430221 is a deficient number, since it is larger than the sum of its proper divisors (323023).

2144430221 is an equidigital number, since it uses as much as digits as its factorization.

2144430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323022.

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

The square root of 2144430221 is about 46307.9930573546. The cubic root of 2144430221 is about 1289.5473886377.

Adding to 2144430221 its reverse (1220344412), we get a palindrome (3364774633).

The spelling of 2144430221 in words is "two billion, one hundred forty-four million, four hundred thirty thousand, two hundred twenty-one".