4043221381 has 2 divisors, whose sum is σ = 4043221382. Its totient is φ = 4043221380.

The previous prime is 4043221373. The next prime is 4043221417. The reversal of 4043221381 is 1831223404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4041144900 + 2076481 = 63570^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 4043221381 - 2³ = 4043221373 is a prime.

It is a super-2 number, since 2×4043221381² = 32695278271551094322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4043221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2021610690 + 2021610691.

It is an arithmetic number, because the mean of its divisors is an integer number (2021610691).

Almost surely, 2^4043221381 is an apocalyptic number.

It is an amenable number.

4043221381 is a deficient number, since it is larger than the sum of its proper divisors (1).

4043221381 is an equidigital number, since it uses as much as digits as its factorization.

4043221381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 4043221381 is about 63586.3301425707. The cubic root of 4043221381 is about 1593.0980537565.

Adding to 4043221381 its reverse (1831223404), we get a palindrome (5874444785).

The spelling of 4043221381 in words is "four billion, forty-three million, two hundred twenty-one thousand, three hundred eighty-one".