22121121222 has 160 divisors (see below), whose sum is σ = 54373334400. Its totient is φ = 6697468800.

The previous prime is 22121121173. The next prime is 22121121233. The reversal of 22121121222 is 22212112122.

It is a happy number.

22121121222 is a `hidden beast` number, since 221 + 211 + 212 + 22 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 22121121195 and 22121121204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7444197 + ... + 7447167.

It is an arithmetic number, because the mean of its divisors is an integer number (339833340).

Almost surely, 2^22121121222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22121121222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27186667200).

22121121222 is an abundant number, since it is smaller than the sum of its proper divisors (32252213178).

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

22121121222 is a wasteful number, since it uses less digits than its factorization.

22121121222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3104 (or 3095 counting only the distinct ones).

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

Adding to 22121121222 its reverse (22212112122), we get a palindrome (44333233344).

It can be divided in two parts, 2212112122 and 2, that multiplied together give a palindrome (4424224244).

The spelling of 22121121222 in words is "twenty-two billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-two".