43431020505221 has 2 divisors, whose sum is σ = 43431020505222. Its totient is φ = 43431020505220.

The previous prime is 43431020505217. The next prime is 43431020505281. The reversal of 43431020505221 is 12250502013434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38570931302500 + 4860089202721 = 6210550^2 + 2204561^2 .

It is a cyclic number.

It is not a de Polignac number, because 43431020505221 - 2² = 43431020505217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43431020505281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21715510252610 + 21715510252611.

It is an arithmetic number, because the mean of its divisors is an integer number (21715510252611).

Almost surely, 2^{43431020505221} is an apocalyptic number.

It is an amenable number.

43431020505221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43431020505221 is an equidigital number, since it uses as much as digits as its factorization.

43431020505221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 43431020505221 its reverse (12250502013434), we get a palindrome (55681522518655).

The spelling of 43431020505221 in words is "forty-three trillion, four hundred thirty-one billion, twenty million, five hundred five thousand, two hundred twenty-one".