43213261643 has 2 divisors, whose sum is σ = 43213261644. Its totient is φ = 43213261642.

The previous prime is 43213261621. The next prime is 43213261661. The reversal of 43213261643 is 34616231234.

43213261643 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43213261643 is a prime.

It is not a weakly prime, because it can be changed into another prime (43213261243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21606630821 + 21606630822.

It is an arithmetic number, because the mean of its divisors is an integer number (21606630822).

Almost surely, 2^43213261643 is an apocalyptic number.

43213261643 is a deficient number, since it is larger than the sum of its proper divisors (1).

43213261643 is an equidigital number, since it uses as much as digits as its factorization.

43213261643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 35.

Adding to 43213261643 its reverse (34616231234), we get a palindrome (77829492877).

The spelling of 43213261643 in words is "forty-three billion, two hundred thirteen million, two hundred sixty-one thousand, six hundred forty-three".