13211122212 has 72 divisors (see below), whose sum is σ = 35388452736. Its totient is φ = 4141234944.

The previous prime is 13211122187. The next prime is 13211122241. The reversal of 13211122212 is 21222111231.

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 23 ways as a sum of consecutive naturals, for example, 789153 + ... + 805719.

It is an arithmetic number, because the mean of its divisors is an integer number (491506288).

Almost surely, 2^13211122212 is an apocalyptic number.

13211122212 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 13211122212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17694226368).

13211122212 is an abundant number, since it is smaller than the sum of its proper divisors (22177330524).

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

13211122212 is a wasteful number, since it uses less digits than its factorization.

13211122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17897 (or 17892 counting only the distinct ones).

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

Adding to 13211122212 its reverse (21222111231), we get a palindrome (34433233443).

The spelling of 13211122212 in words is "thirteen billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twelve".