43274426821 has 2 divisors, whose sum is σ = 43274426822. Its totient is φ = 43274426820.

The previous prime is 43274426779. The next prime is 43274426851. The reversal of 43274426821 is 12862447234.

It is a happy number.

43274426821 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 can be written as a sum of positive squares in only one way, i.e., 38951364321 + 4323062500 = 197361^2 + 65750^2 .

It is a cyclic number.

It is not a de Polignac number, because 43274426821 - 2⁹ = 43274426309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43274426851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21637213410 + 21637213411.

It is an arithmetic number, because the mean of its divisors is an integer number (21637213411).

Almost surely, 2^43274426821 is an apocalyptic number.

It is an amenable number.

43274426821 is a deficient number, since it is larger than the sum of its proper divisors (1).

43274426821 is an equidigital number, since it uses as much as digits as its factorization.

43274426821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 43.

The spelling of 43274426821 in words is "forty-three billion, two hundred seventy-four million, four hundred twenty-six thousand, eight hundred twenty-one".