505084209221 has 2 divisors, whose sum is σ = 505084209222. Its totient is φ = 505084209220.

The previous prime is 505084209209. The next prime is 505084209241. The reversal of 505084209221 is 122902480505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402755236900 + 102328972321 = 634630^2 + 319889^2 .

It is a cyclic number.

It is not a de Polignac number, because 505084209221 - 2¹⁰ = 505084208197 is a prime.

It is a super-2 number, since 2×505084209221² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505084209241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252542104610 + 252542104611.

It is an arithmetic number, because the mean of its divisors is an integer number (252542104611).

Almost surely, 2^505084209221 is an apocalyptic number.

It is an amenable number.

505084209221 is a deficient number, since it is larger than the sum of its proper divisors (1).

505084209221 is an equidigital number, since it uses as much as digits as its factorization.

505084209221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 38.

Adding to 505084209221 its reverse (122902480505), we get a palindrome (627986689726).

The spelling of 505084209221 in words is "five hundred five billion, eighty-four million, two hundred nine thousand, two hundred twenty-one".