4143444421 has 2 divisors, whose sum is σ = 4143444422. Its totient is φ = 4143444420.

The previous prime is 4143444419. The next prime is 4143444427. The reversal of 4143444421 is 1244443414.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2142671521 + 2000772900 = 46289^2 + 44730^2 .

It is a cyclic number.

It is not a de Polignac number, because 4143444421 - 2¹ = 4143444419 is a prime.

Together with 4143444419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4143444427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2071722210 + 2071722211.

It is an arithmetic number, because the mean of its divisors is an integer number (2071722211).

Almost surely, 2^4143444421 is an apocalyptic number.

It is an amenable number.

4143444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4143444421 is an equidigital number, since it uses as much as digits as its factorization.

4143444421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 31.

The square root of 4143444421 is about 64369.5923631648. The cubic root of 4143444421 is about 1606.1539591302.

Adding to 4143444421 its reverse (1244443414), we get a palindrome (5387887835).

The spelling of 4143444421 in words is "four billion, one hundred forty-three million, four hundred forty-four thousand, four hundred twenty-one".