43534255021 has 2 divisors, whose sum is σ = 43534255022. Its totient is φ = 43534255020.

The previous prime is 43534255007. The next prime is 43534255069. The reversal of 43534255021 is 12055243534.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35049081796 + 8485173225 = 187214^2 + 92115^2 .

It is a cyclic number.

It is not a de Polignac number, because 43534255021 - 2⁵ = 43534254989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43534255321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21767127510 + 21767127511.

It is an arithmetic number, because the mean of its divisors is an integer number (21767127511).

Almost surely, 2^43534255021 is an apocalyptic number.

It is an amenable number.

43534255021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43534255021 is an equidigital number, since it uses as much as digits as its factorization.

43534255021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 43534255021 its reverse (12055243534), we get a palindrome (55589498555).

The spelling of 43534255021 in words is "forty-three billion, five hundred thirty-four million, two hundred fifty-five thousand, twenty-one".