43211213355221 has 2 divisors, whose sum is σ = 43211213355222. Its totient is φ = 43211213355220.

The previous prime is 43211213355203. The next prime is 43211213355229. The reversal of 43211213355221 is 12255331211234.

43211213355221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41676127047025 + 1535086308196 = 6455705^2 + 1238986^2 .

It is a cyclic number.

It is not a de Polignac number, because 43211213355221 - 2²⁶ = 43211146246357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43211213355229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21605606677610 + 21605606677611.

It is an arithmetic number, because the mean of its divisors is an integer number (21605606677611).

Almost surely, 2^{43211213355221} is an apocalyptic number.

It is an amenable number.

43211213355221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43211213355221 is an equidigital number, since it uses as much as digits as its factorization.

43211213355221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 35.

Adding to 43211213355221 its reverse (12255331211234), we get a palindrome (55466544566455).

The spelling of 43211213355221 in words is "forty-three trillion, two hundred eleven billion, two hundred thirteen million, three hundred fifty-five thousand, two hundred twenty-one".