212221223220 has 24 divisors (see below), whose sum is σ = 594219425184. Its totient is φ = 56592326176.

The previous prime is 212221223213. The next prime is 212221223237. The reversal of 212221223220 is 22322122212.

212221223220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1768510134 + ... + 1768510253.

It is an arithmetic number, because the mean of its divisors is an integer number (24759142716).

Almost surely, 2^212221223220 is an apocalyptic number.

212221223220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212221223220 is an abundant number, since it is smaller than the sum of its proper divisors (381998201964).

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

212221223220 is a wasteful number, since it uses less digits than its factorization.

212221223220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3537020399 (or 3537020397 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 212221223220 its reverse (22322122212), we get a palindrome (234543345432).

The spelling of 212221223220 in words is "two hundred twelve billion, two hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty".