22021222212 has 108 divisors (see below), whose sum is σ = 63845745600. Its totient is φ = 6382933920.

The previous prime is 22021222199. The next prime is 22021222219. The reversal of 22021222212 is 21222212022.

22021222212 is a `hidden beast` number, since 220 + 212 + 22 + 212 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (22021222219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9712 + ... + 210087.

Almost surely, 2^22021222212 is an apocalyptic number.

22021222212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22021222212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31922872800).

22021222212 is an abundant number, since it is smaller than the sum of its proper divisors (41824523388).

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

22021222212 is a wasteful number, since it uses less digits than its factorization.

22021222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219854 (or 219838 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 22021222212 its reverse (21222212022), we get a palindrome (43243434234).

The spelling of 22021222212 in words is "twenty-two billion, twenty-one million, two hundred twenty-two thousand, two hundred twelve".