4143231221 has 2 divisors, whose sum is σ = 4143231222. Its totient is φ = 4143231220.

The previous prime is 4143231193. The next prime is 4143231263. The reversal of 4143231221 is 1221323414.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2390134321 + 1753096900 = 48889^2 + 41870^2 .

It is a cyclic number.

It is not a de Polignac number, because 4143231221 - 2¹⁴ = 4143214837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4143231121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2071615610 + 2071615611.

It is an arithmetic number, because the mean of its divisors is an integer number (2071615611).

Almost surely, 2^4143231221 is an apocalyptic number.

It is an amenable number.

4143231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4143231221 is an equidigital number, since it uses as much as digits as its factorization.

4143231221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 23.

The square root of 4143231221 is about 64367.9362804184. The cubic root of 4143231221 is about 1606.1264105609.

Adding to 4143231221 its reverse (1221323414), we get a palindrome (5364554635).

The spelling of 4143231221 in words is "four billion, one hundred forty-three million, two hundred thirty-one thousand, two hundred twenty-one".