1213122222 has 144 divisors (see below), whose sum is σ = 3037507200. Its totient is φ = 348753600.

The previous prime is 1213122181. The next prime is 1213122223. The reversal of 1213122222 is 2222213121.

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.

It is a junction number, because it is equal to n+sod(n) for n = 1213122195 and 1213122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213122223) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8033847 + ... + 8033997.

It is an arithmetic number, because the mean of its divisors is an integer number (21093800).

Almost surely, 2^1213122222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213122222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1518753600).

1213122222 is an abundant number, since it is smaller than the sum of its proper divisors (1824384978).

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

1213122222 is a wasteful number, since it uses less digits than its factorization.

1213122222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343 (or 327 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1213122222 is about 34829.9041342350. The cubic root of 1213122222 is about 1066.5179913658.

Adding to 1213122222 its reverse (2222213121), we get a palindrome (3435335343).

The spelling of 1213122222 in words is "one billion, two hundred thirteen million, one hundred twenty-two thousand, two hundred twenty-two".