506212221 has 32 divisors (see below), whose sum is σ = 722239488. Its totient is φ = 314677440.

The previous prime is 506212219. The next prime is 506212261. The reversal of 506212221 is 122212605.

It is a happy number.

It is not a de Polignac number, because 506212221 - 2¹ = 506212219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506212261) 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, 534070 + ... + 535016.

It is an arithmetic number, because the mean of its divisors is an integer number (22569984).

Almost surely, 2^506212221 is an apocalyptic number.

It is an amenable number.

506212221 is a deficient number, since it is larger than the sum of its proper divisors (216027267).

506212221 is a wasteful number, since it uses less digits than its factorization.

506212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 506212221 is about 22499.1604510035. The cubic root of 506212221 is about 796.9741011207.

Adding to 506212221 its reverse (122212605), we get a palindrome (628424826).

The spelling of 506212221 in words is "five hundred six million, two hundred twelve thousand, two hundred twenty-one".