1222212212 has 72 divisors (see below), whose sum is σ = 2466570624. Its totient is φ = 526652928.

The previous prime is 1222212197. The next prime is 1222212217. The reversal of 1222212212 is 2122122221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222212217) 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, 2509433 + ... + 2509919.

Almost surely, 2^1222212212 is an apocalyptic number.

It is an amenable number.

1222212212 is an abundant number, since it is smaller than the sum of its proper divisors (1244358412).

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

1222212212 is a wasteful number, since it uses less digits than its factorization.

1222212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 686 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 1222212212 is about 34960.1517731259. The cubic root of 1222212212 is about 1069.1751910696.

Adding to 1222212212 its reverse (2122122221), we get a palindrome (3344334433).

The spelling of 1222212212 in words is "one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twelve".