22121211222 has 48 divisors (see below), whose sum is σ = 52399646208. Its totient is φ = 6688891440.

The previous prime is 22121211221. The next prime is 22121211251. The reversal of 22121211222 is 22211212122.

It is a happy number.

22121211222 is a `hidden beast` number, since 221 + 212 + 11 + 222 = 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 = 22121211195 and 22121211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121211221) 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 23 ways as a sum of consecutive naturals, for example, 28978 + ... + 212325.

It is an arithmetic number, because the mean of its divisors is an integer number (1091659296).

Almost surely, 2^22121211222 is an apocalyptic number.

22121211222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22121211222 is an abundant number, since it is smaller than the sum of its proper divisors (30278434986).

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

22121211222 is a wasteful number, since it uses less digits than its factorization.

22121211222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241785 (or 241782 counting only the distinct ones).

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

Adding to 22121211222 its reverse (22211212122), we get a palindrome (44332423344).

The spelling of 22121211222 in words is "twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-two".