11212213212 has 96 divisors (see below), whose sum is σ = 29414629440. Its totient is φ = 3693081600.

The previous prime is 11212213163. The next prime is 11212213231. The reversal of 11212213212 is 21231221211.

11212213212 is a `hidden beast` number, since 1 + 121 + 221 + 321 + 2 = 666.

It is a super-2 number, since 2×11212213212² (a number of 21 digits) contains 22 as substring.

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10220248 + ... + 10221344.

It is an arithmetic number, because the mean of its divisors is an integer number (306402390).

Almost surely, 2^11212213212 is an apocalyptic number.

11212213212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11212213212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14707314720).

11212213212 is an abundant number, since it is smaller than the sum of its proper divisors (18202416228).

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

11212213212 is a wasteful number, since it uses less digits than its factorization.

11212213212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2148 (or 2140 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 11212213212 its reverse (21231221211), we get a palindrome (32443434423).

The spelling of 11212213212 in words is "eleven billion, two hundred twelve million, two hundred thirteen thousand, two hundred twelve".