22212222 has 8 divisors (see below), whose sum is σ = 44424456. Its totient is φ = 7404072.

The previous prime is 22212199. The next prime is 22212233. The reversal of 22212222 is 22221222.

It is a sphenic number, since it is the product of 3 distinct primes.

22212222 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 1851013 + ... + 1851024.

It is an arithmetic number, because the mean of its divisors is an integer number (5553057).

Almost surely, 2^22212222 is an apocalyptic number.

22212222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

22212222 is a wasteful number, since it uses less digits than its factorization.

22212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702042.

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

The square root of 22212222 is about 4712.9844048119. The cubic root of 22212222 is about 281.1020428692.

Adding to 22212222 its reverse (22221222), we get a palindrome (44433444).

It can be divided in two parts, 2221222 and 2, that multiplied together give a palindrome (4442444).

The spelling of 22212222 in words is "twenty-two million, two hundred twelve thousand, two hundred twenty-two".