4021444421 has 2 divisors, whose sum is σ = 4021444422. Its totient is φ = 4021444420.

The previous prime is 4021444391. The next prime is 4021444423. The reversal of 4021444421 is 1244441204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3716243521 + 305200900 = 60961^2 + 17470^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021444421 - 2²² = 4017250117 is a prime.

Together with 4021444423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021444423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010722210 + 2010722211.

It is an arithmetic number, because the mean of its divisors is an integer number (2010722211).

Almost surely, 2^4021444421 is an apocalyptic number.

It is an amenable number.

4021444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021444421 is an equidigital number, since it uses as much as digits as its factorization.

4021444421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 4021444421 is about 63414.8596229622. The cubic root of 4021444421 is about 1590.2327390278.

Adding to 4021444421 its reverse (1244441204), we get a palindrome (5265885625).

The spelling of 4021444421 in words is "four billion, twenty-one million, four hundred forty-four thousand, four hundred twenty-one".