12212112220 has 144 divisors (see below), whose sum is σ = 32667643008. Its totient is φ = 3791975040.

The previous prime is 12212112181. The next prime is 12212112233. The reversal of 12212112220 is 2221121221.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12212112194 and 12212112203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3048739 + ... + 3052741.

It is an arithmetic number, because the mean of its divisors is an integer number (226858632).

Almost surely, 2^12212112220 is an apocalyptic number.

12212112220 is a gapful number since it is divisible by the number (10) 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 12212112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16333821504).

12212112220 is an abundant number, since it is smaller than the sum of its proper divisors (20455530788).

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

12212112220 is a wasteful number, since it uses less digits than its factorization.

12212112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4320 (or 4311 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12212112220 its reverse (2221121221), we get a palindrome (14433233441).

Subtracting from 12212112220 its reverse (2221121221), we obtain a palindrome (9990990999).

The spelling of 12212112220 in words is "twelve billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty".