4021442232221 has 2 divisors, whose sum is σ = 4021442232222. Its totient is φ = 4021442232220.

The previous prime is 4021442232193. The next prime is 4021442232299. The reversal of 4021442232221 is 1222322441204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2614575811225 + 1406866420996 = 1616965^2 + 1186114^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021442232221 - 2²⁶ = 4021375123357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021442238221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010721116110 + 2010721116111.

It is an arithmetic number, because the mean of its divisors is an integer number (2010721116111).

Almost surely, 2^{4021442232221} is an apocalyptic number.

It is an amenable number.

4021442232221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021442232221 is an equidigital number, since it uses as much as digits as its factorization.

4021442232221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 4021442232221 its reverse (1222322441204), we get a palindrome (5243764673425).

The spelling of 4021442232221 in words is "four trillion, twenty-one billion, four hundred forty-two million, two hundred thirty-two thousand, two hundred twenty-one".