43011021643 has 2 divisors, whose sum is σ = 43011021644. Its totient is φ = 43011021642.

The previous prime is 43011021611. The next prime is 43011021659. The reversal of 43011021643 is 34612011034.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43011021643 - 2⁵ = 43011021611 is a prime.

It is a super-2 number, since 2×43011021643² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43011021673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21505510821 + 21505510822.

It is an arithmetic number, because the mean of its divisors is an integer number (21505510822).

Almost surely, 2^43011021643 is an apocalyptic number.

43011021643 is a deficient number, since it is larger than the sum of its proper divisors (1).

43011021643 is an equidigital number, since it uses as much as digits as its factorization.

43011021643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 43011021643 its reverse (34612011034), we get a palindrome (77623032677).

The spelling of 43011021643 in words is "forty-three billion, eleven million, twenty-one thousand, six hundred forty-three".