12213223212 has 48 divisors (see below), whose sum is σ = 29544530400. Its totient is φ = 3922114560.

The previous prime is 12213223201. The next prime is 12213223271. The reversal of 12213223212 is 21232231221.

It is a super-2 number, since 2×12213223212² (a number of 21 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 122364 + ... + 198492.

It is an arithmetic number, because the mean of its divisors is an integer number (615511050).

Almost surely, 2^12213223212 is an apocalyptic number.

12213223212 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 12213223212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14772265200).

12213223212 is an abundant number, since it is smaller than the sum of its proper divisors (17331307188).

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

12213223212 is a wasteful number, since it uses less digits than its factorization.

12213223212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76626 (or 76624 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

Adding to 12213223212 its reverse (21232231221), we get a palindrome (33445454433).

The spelling of 12213223212 in words is "twelve billion, two hundred thirteen million, two hundred twenty-three thousand, two hundred twelve".