11221222212 has 36 divisors (see below), whose sum is σ = 29131374636. Its totient is φ = 3639314880.

The previous prime is 11221222189. The next prime is 11221222231. The reversal of 11221222212 is 21222212211.

It is a happy number.

11221222212 is a `hidden beast` number, since 11 + 221 + 222 + 212 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7831188036 + 3390034176 = 88494^2 + 58224^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4210839 + ... + 4213502.

It is an arithmetic number, because the mean of its divisors is an integer number (809204851).

Almost surely, 2^11221222212 is an apocalyptic number.

11221222212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

11221222212 is an abundant number, since it is smaller than the sum of its proper divisors (17910152424).

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

11221222212 is a wasteful number, since it uses less digits than its factorization.

11221222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8424388 (or 8424383 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 11221222212 its reverse (21222212211), we get a palindrome (32443434423).

The spelling of 11221222212 in words is "eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".