52555550221 has 2 divisors, whose sum is σ = 52555550222. Its totient is φ = 52555550220.

The previous prime is 52555550209. The next prime is 52555550227. The reversal of 52555550221 is 12205555525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39986001225 + 12569548996 = 199965^2 + 112114^2 .

It is a cyclic number.

It is not a de Polignac number, because 52555550221 - 2⁵ = 52555550189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52555550227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26277775110 + 26277775111.

It is an arithmetic number, because the mean of its divisors is an integer number (26277775111).

Almost surely, 2^52555550221 is an apocalyptic number.

It is an amenable number.

52555550221 is a deficient number, since it is larger than the sum of its proper divisors (1).

52555550221 is an equidigital number, since it uses as much as digits as its factorization.

52555550221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125000, while the sum is 37.

The spelling of 52555550221 in words is "fifty-two billion, five hundred fifty-five million, five hundred fifty thousand, two hundred twenty-one".