43476880021 has 2 divisors, whose sum is σ = 43476880022. Its totient is φ = 43476880020.

The previous prime is 43476880001. The next prime is 43476880037. The reversal of 43476880021 is 12008867434.

43476880021 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., 35424509796 + 8052370225 = 188214^2 + 89735^2 .

It is a cyclic number.

It is not a de Polignac number, because 43476880021 - 2¹¹ = 43476877973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43476880021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43476880001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21738440010 + 21738440011.

It is an arithmetic number, because the mean of its divisors is an integer number (21738440011).

Almost surely, 2^43476880021 is an apocalyptic number.

It is an amenable number.

43476880021 is a deficient number, since it is larger than the sum of its proper divisors (1).

43476880021 is an equidigital number, since it uses as much as digits as its factorization.

43476880021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 43.

The spelling of 43476880021 in words is "forty-three billion, four hundred seventy-six million, eight hundred eighty thousand, twenty-one".