212221320306 has 32 divisors (see below), whose sum is σ = 457172010240. Its totient is φ = 65458716624.

The previous prime is 212221320293. The next prime is 212221320307. The reversal of 212221320306 is 603023122212.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (212221320307) 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 in 15 ways as a sum of consecutive naturals, for example, 21641500 + ... + 21651303.

It is an arithmetic number, because the mean of its divisors is an integer number (14286625320).

Almost surely, 2^212221320306 is an apocalyptic number.

212221320306 is an abundant number, since it is smaller than the sum of its proper divisors (244950689934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212221320306 is a wasteful number, since it uses less digits than its factorization.

212221320306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43292870.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 212221320306 its reverse (603023122212), we get a palindrome (815244442518).

The spelling of 212221320306 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred twenty thousand, three hundred six".