55421445520213 has 2 divisors, whose sum is σ = 55421445520214. Its totient is φ = 55421445520212.

The previous prime is 55421445520159. The next prime is 55421445520223. The reversal of 55421445520213 is 31202554412455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47987305180369 + 7434140339844 = 6927287^2 + 2726562^2 .

It is a cyclic number.

It is not a de Polignac number, because 55421445520213 - 2⁹ = 55421445519701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55421445520213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55421445520223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27710722760106 + 27710722760107.

It is an arithmetic number, because the mean of its divisors is an integer number (27710722760107).

Almost surely, 2^{55421445520213} is an apocalyptic number.

It is an amenable number.

55421445520213 is a deficient number, since it is larger than the sum of its proper divisors (1).

55421445520213 is an equidigital number, since it uses as much as digits as its factorization.

55421445520213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960000, while the sum is 43.

Adding to 55421445520213 its reverse (31202554412455), we get a palindrome (86623999932668).

The spelling of 55421445520213 in words is "fifty-five trillion, four hundred twenty-one billion, four hundred forty-five million, five hundred twenty thousand, two hundred thirteen".