22212121212 has 48 divisors (see below), whose sum is σ = 57634795680. Its totient is φ = 7397892864.

The previous prime is 22212121207. The next prime is 22212121213. The reversal of 22212121212 is 21212121222.

It is a happy number.

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.

22212121212 is a modest number, since divided by 121212 gives 22212 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22212121213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46228 + ... + 215780.

It is an arithmetic number, because the mean of its divisors is an integer number (1200724910).

Almost surely, 2^22212121212 is an apocalyptic number.

It is an amenable number.

22212121212 is an abundant number, since it is smaller than the sum of its proper divisors (35422674468).

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

22212121212 is a wasteful number, since it uses less digits than its factorization.

22212121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170779 (or 170771 counting only the distinct ones).

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

Adding to 22212121212 its reverse (21212121222), we get a palindrome (43424242434).

It can be divided in two parts, 22 and 212121212, that multiplied together give a palindrome (4666666664).

The spelling of 22212121212 in words is "twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twelve".