3538806774221 has 2 divisors, whose sum is σ = 3538806774222. Its totient is φ = 3538806774220.

The previous prime is 3538806774211. The next prime is 3538806774233. The reversal of 3538806774221 is 1224776088353.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3008538816196 + 530267958025 = 1734514^2 + 728195^2 .

It is a cyclic number.

It is not a de Polignac number, because 3538806774221 - 2³⁴ = 3521626905037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3538806774211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1769403387110 + 1769403387111.

It is an arithmetic number, because the mean of its divisors is an integer number (1769403387111).

Almost surely, 2^{3538806774221} is an apocalyptic number.

It is an amenable number.

3538806774221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3538806774221 is an equidigital number, since it uses as much as digits as its factorization.

3538806774221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 3538806774221 in words is "three trillion, five hundred thirty-eight billion, eight hundred six million, seven hundred seventy-four thousand, two hundred twenty-one".