550221025621 has 2 divisors, whose sum is σ = 550221025622. Its totient is φ = 550221025620.

The previous prime is 550221025609. The next prime is 550221025709. The reversal of 550221025621 is 126520122055.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 365698372900 + 184522652721 = 604730^2 + 429561^2 .

It is a cyclic number.

It is not a de Polignac number, because 550221025621 - 2¹³ = 550221017429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (550221022621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275110512810 + 275110512811.

It is an arithmetic number, because the mean of its divisors is an integer number (275110512811).

Almost surely, 2^550221025621 is an apocalyptic number.

It is an amenable number.

550221025621 is a deficient number, since it is larger than the sum of its proper divisors (1).

550221025621 is an equidigital number, since it uses as much as digits as its factorization.

550221025621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 550221025621 its reverse (126520122055), we get a palindrome (676741147676).

The spelling of 550221025621 in words is "five hundred fifty billion, two hundred twenty-one million, twenty-five thousand, six hundred twenty-one".