43113223421 has 2 divisors, whose sum is σ = 43113223422. Its totient is φ = 43113223420.

The previous prime is 43113223397. The next prime is 43113223427. The reversal of 43113223421 is 12432231134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32430967396 + 10682256025 = 180086^2 + 103355^2 .

It is a cyclic number.

It is not a de Polignac number, because 43113223421 - 2¹⁴ = 43113207037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43113223427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21556611710 + 21556611711.

It is an arithmetic number, because the mean of its divisors is an integer number (21556611711).

Almost surely, 2^43113223421 is an apocalyptic number.

It is an amenable number.

43113223421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43113223421 is an equidigital number, since it uses as much as digits as its factorization.

43113223421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

Adding to 43113223421 its reverse (12432231134), we get a palindrome (55545454555).

The spelling of 43113223421 in words is "forty-three billion, one hundred thirteen million, two hundred twenty-three thousand, four hundred twenty-one".