5543420243521 has 2 divisors, whose sum is σ = 5543420243522. Its totient is φ = 5543420243520.

The previous prime is 5543420243437. The next prime is 5543420243551. The reversal of 5543420243521 is 1253420243455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5373754514496 + 169665729025 = 2318136^2 + 411905^2 .

It is a cyclic number.

It is not a de Polignac number, because 5543420243521 - 2¹¹ = 5543420241473 is a prime.

It is not a weakly prime, because it can be changed into another prime (5543420243551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2771710121760 + 2771710121761.

It is an arithmetic number, because the mean of its divisors is an integer number (2771710121761).

Almost surely, 2^{5543420243521} is an apocalyptic number.

It is an amenable number.

5543420243521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5543420243521 is an equidigital number, since it uses as much as digits as its factorization.

5543420243521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 40.

Adding to 5543420243521 its reverse (1253420243455), we get a palindrome (6796840486976).

The spelling of 5543420243521 in words is "five trillion, five hundred forty-three billion, four hundred twenty million, two hundred forty-three thousand, five hundred twenty-one".