505223522221 has 32 divisors (see below), whose sum is σ = 572194160640. Its totient is φ = 442136323200.

The previous prime is 505223522197. The next prime is 505223522299. The reversal of 505223522221 is 122225322505.

It is a happy number.

It is not a de Polignac number, because 505223522221 - 2⁹ = 505223521709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505223522021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8759740 + ... + 8817226.

It is an arithmetic number, because the mean of its divisors is an integer number (17881067520).

Almost surely, 2^505223522221 is an apocalyptic number.

It is an amenable number.

505223522221 is a deficient number, since it is larger than the sum of its proper divisors (66970638419).

505223522221 is a wasteful number, since it uses less digits than its factorization.

505223522221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57825.

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 505223522221 its reverse (122225322505), we get a palindrome (627448844726).

The spelling of 505223522221 in words is "five hundred five billion, two hundred twenty-three million, five hundred twenty-two thousand, two hundred twenty-one".