212221101222 has 128 divisors (see below), whose sum is σ = 515626352640. Its totient is φ = 64309680000.

The previous prime is 212221101199. The next prime is 212221101227. The reversal of 212221101222 is 222101122212.

It is a happy number.

212221101222 is a `hidden beast` number, since 212 + 221 + 10 + 1 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212221101195 and 212221101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221101227) 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 63 ways as a sum of consecutive naturals, for example, 13534447 + ... + 13550117.

It is an arithmetic number, because the mean of its divisors is an integer number (4028330880).

Almost surely, 2^212221101222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212221101222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257813176320).

212221101222 is an abundant number, since it is smaller than the sum of its proper divisors (303405251418).

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

212221101222 is a wasteful number, since it uses less digits than its factorization.

212221101222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15987 (or 15981 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 212221101222 its reverse (222101122212), we get a palindrome (434322223434).

The spelling of 212221101222 in words is "two hundred twelve billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty-two".