4021442238221 has 2 divisors, whose sum is σ = 4021442238222. Its totient is φ = 4021442238220.

The previous prime is 4021442238193. The next prime is 4021442238241. The reversal of 4021442238221 is 1228322441204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4019042610025 + 2399628196 = 2004755^2 + 48986^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021442238221 - 2⁶ = 4021442238157 is a prime.

It is a super-2 number, since 2×4021442238221² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021442238241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010721119110 + 2010721119111.

It is an arithmetic number, because the mean of its divisors is an integer number (2010721119111).

Almost surely, 2^{4021442238221} is an apocalyptic number.

It is an amenable number.

4021442238221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021442238221 is an equidigital number, since it uses as much as digits as its factorization.

4021442238221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49152, while the sum is 35.

Adding to 4021442238221 its reverse (1228322441204), we get a palindrome (5249764679425).

The spelling of 4021442238221 in words is "four trillion, twenty-one billion, four hundred forty-two million, two hundred thirty-eight thousand, two hundred twenty-one".