43040004221 has 2 divisors, whose sum is σ = 43040004222. Its totient is φ = 43040004220.

The previous prime is 43040004197. The next prime is 43040004251. The reversal of 43040004221 is 12240004034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43002316900 + 37687321 = 207370^2 + 6139^2 .

It is a cyclic number.

It is not a de Polignac number, because 43040004221 - 2⁶ = 43040004157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43040004193 and 43040004202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43040004251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21520002110 + 21520002111.

It is an arithmetic number, because the mean of its divisors is an integer number (21520002111).

Almost surely, 2^43040004221 is an apocalyptic number.

It is an amenable number.

43040004221 is a deficient number, since it is larger than the sum of its proper divisors (1).

43040004221 is an equidigital number, since it uses as much as digits as its factorization.

43040004221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 43040004221 its reverse (12240004034), we get a palindrome (55280008255).

The spelling of 43040004221 in words is "forty-three billion, forty million, four thousand, two hundred twenty-one".