22220221212 has 192 divisors, whose sum is σ = 69818112000. Its totient is φ = 5965968384.

The previous prime is 22220221211. The next prime is 22220221237. The reversal of 22220221212 is 21212202222.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220221211) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14252089 + ... + 14253647.

It is an arithmetic number, because the mean of its divisors is an integer number (363636000).

Almost surely, 2^22220221212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22220221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34909056000).

22220221212 is an abundant number, since it is smaller than the sum of its proper divisors (47597890788).

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

22220221212 is a wasteful number, since it uses less digits than its factorization.

22220221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2705 (or 2697 counting only the distinct ones).

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

Adding to 22220221212 its reverse (21212202222), we get a palindrome (43432423434).

The spelling of 22220221212 in words is "twenty-two billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twelve".