22222212 has 12 divisors (see below), whose sum is σ = 51851856. Its totient is φ = 7407400.

The previous prime is 22222199. The next prime is 22222223. The reversal of 22222212 is 21222222.

It is a tau number, because it is divible by the number of its divisors (12).

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 = 22222191 and 22222200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925914 + ... + 925937.

It is an arithmetic number, because the mean of its divisors is an integer number (4320988).

Almost surely, 2^22222212 is an apocalyptic number.

It is an amenable number.

22222212 is an abundant number, since it is smaller than the sum of its proper divisors (29629644).

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

22222212 is a wasteful number, since it uses less digits than its factorization.

22222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1851858 (or 1851856 counting only the distinct ones).

The product of its digits is 128, while the sum is 15.

The square root of 22222212 is about 4714.0441236798. The cubic root of 22222212 is about 281.1441786585.

Adding to 22222212 its reverse (21222222), we get a palindrome (43444434).

The spelling of 22222212 in words is "twenty-two million, two hundred twenty-two thousand, two hundred twelve".