2143431221 has 2 divisors, whose sum is σ = 2143431222. Its totient is φ = 2143431220.

The previous prime is 2143431181. The next prime is 2143431229. The reversal of 2143431221 is 1221343412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2129822500 + 13608721 = 46150^2 + 3689^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143431221 - 2¹⁰ = 2143430197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143431229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071715610 + 1071715611.

It is an arithmetic number, because the mean of its divisors is an integer number (1071715611).

Almost surely, 2^2143431221 is an apocalyptic number.

It is an amenable number.

2143431221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143431221 is an equidigital number, since it uses as much as digits as its factorization.

2143431221 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2143431221 is about 46297.2053260237. The cubic root of 2143431221 is about 1289.3471088728.

Adding to 2143431221 its reverse (1221343412), we get a palindrome (3364774633).

The spelling of 2143431221 in words is "two billion, one hundred forty-three million, four hundred thirty-one thousand, two hundred twenty-one".