222121111220 has 12 divisors (see below), whose sum is σ = 466454333604. Its totient is φ = 88848444480.

The previous prime is 222121111187. The next prime is 222121111241. The reversal of 222121111220 is 22111121222.

It can be written as a sum of positive squares in 2 ways, for example, as 103595147044 + 118525964176 = 321862^2 + 344276^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553027761 + ... + 5553027800.

It is an arithmetic number, because the mean of its divisors is an integer number (38871194467).

Almost surely, 2^222121111220 is an apocalyptic number.

222121111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121111220 is an abundant number, since it is smaller than the sum of its proper divisors (244333222384).

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

222121111220 is a wasteful number, since it uses less digits than its factorization.

222121111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11106055570 (or 11106055568 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222121111220 its reverse (22111121222), we get a palindrome (244232232442).

The spelling of 222121111220 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred eleven thousand, two hundred twenty".