1212222222 has 48 divisors (see below), whose sum is σ = 2752963200. Its totient is φ = 384773136.

The previous prime is 1212222217. The next prime is 1212222227. The reversal of 1212222222 is 2222222121.

It is an interprime number because it is at equal distance from previous prime (1212222217) and next prime (1212222227).

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.

1212222222 is a modest number, since divided by 22222 gives 12122 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1212222195 and 1212222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212222227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87529 + ... + 100427.

It is an arithmetic number, because the mean of its divisors is an integer number (57353400).

Almost surely, 2^1212222222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212222222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1376481600).

1212222222 is an abundant number, since it is smaller than the sum of its proper divisors (1540740978).

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

1212222222 is a wasteful number, since it uses less digits than its factorization.

1212222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13157 (or 13154 counting only the distinct ones).

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

The square root of 1212222222 is about 34816.9818048607. The cubic root of 1212222222 is about 1066.2541807226.

Adding to 1212222222 its reverse (2222222121), we get a palindrome (3434444343).

It can be divided in two parts, 121 and 2222222, that multiplied together give a palindrome (268888862).

The spelling of 1212222222 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred twenty-two".