43031133221 has 2 divisors, whose sum is σ = 43031133222. Its totient is φ = 43031133220.

The previous prime is 43031133209. The next prime is 43031133289. The reversal of 43031133221 is 12233113034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21700530721 + 21330602500 = 147311^2 + 146050^2 .

It is a cyclic number.

It is not a de Polignac number, because 43031133221 - 2⁶ = 43031133157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43031136221) 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, 21515566610 + 21515566611.

It is an arithmetic number, because the mean of its divisors is an integer number (21515566611).

Almost surely, 2^43031133221 is an apocalyptic number.

It is an amenable number.

43031133221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43031133221 is an equidigital number, since it uses as much as digits as its factorization.

43031133221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 43031133221 its reverse (12233113034), we get a palindrome (55264246255).

The spelling of 43031133221 in words is "forty-three billion, thirty-one million, one hundred thirty-three thousand, two hundred twenty-one".