11221231212 has 96 divisors (see below), whose sum is σ = 29449156800. Its totient is φ = 3694657536.

The previous prime is 11221231201. The next prime is 11221231249. The reversal of 11221231212 is 21213212211.

11221231212 is a `hidden beast` number, since 1 + 1 + 221 + 231 + 212 = 666.

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 31 ways as a sum of consecutive naturals, for example, 9731628 + ... + 9732780.

It is an arithmetic number, because the mean of its divisors is an integer number (306762050).

Almost surely, 2^11221231212 is an apocalyptic number.

11221231212 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 11221231212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14724578400).

11221231212 is an abundant number, since it is smaller than the sum of its proper divisors (18227925588).

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

11221231212 is a wasteful number, since it uses less digits than its factorization.

11221231212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192 (or 2184 counting only the distinct ones).

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

Adding to 11221231212 its reverse (21213212211), we get a palindrome (32434443423).

The spelling of 11221231212 in words is "eleven billion, two hundred twenty-one million, two hundred thirty-one thousand, two hundred twelve".