22222121221212 has 48 divisors (see below), whose sum is σ = 56571418307712. Its totient is φ = 6733259599680.

The previous prime is 22222121221207. The next prime is 22222121221229. The reversal of 22222121221212 is 21212212122222.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7710703 + ... + 10193094.

It is an arithmetic number, because the mean of its divisors is an integer number (1178571214744).

Almost surely, 2^{22222121221212} is an apocalyptic number.

22222121221212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22222121221212 is an abundant number, since it is smaller than the sum of its proper divisors (34349297086500).

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

22222121221212 is a wasteful number, since it uses less digits than its factorization.

22222121221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17913218 (or 17913216 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

Adding to 22222121221212 its reverse (21212212122222), we get a palindrome (43434333343434).

The spelling of 22222121221212 in words is "twenty-two trillion, two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twelve".