2221212222 has 12 divisors (see below), whose sum is σ = 4812626520. Its totient is φ = 740404068.

The previous prime is 2221212211. The next prime is 2221212223. The reversal of 2221212222 is 2222121222.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 123400679 = 2221212222 / (2 + 2 + 2 + 1 + 2 + 1 + 2 + 2 + 2 + 2).

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 = 2221212195 and 2221212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221212223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61700322 + ... + 61700357.

It is an arithmetic number, because the mean of its divisors is an integer number (401052210).

Almost surely, 2^2221212222 is an apocalyptic number.

2221212222 is an abundant number, since it is smaller than the sum of its proper divisors (2591414298).

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

2221212222 is a wasteful number, since it uses less digits than its factorization.

2221212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123400687 (or 123400684 counting only the distinct ones).

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

The square root of 2221212222 is about 47129.7381915071. The cubic root of 2221212222 is about 1304.7581495710.

Adding to 2221212222 its reverse (2222121222), we get a palindrome (4443333444).

It can be divided in two parts, 222121222 and 2, that multiplied together give a palindrome (444242444).

The spelling of 2221212222 in words is "two billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".