12212213220 has 72 divisors (see below), whose sum is σ = 37053918720. Its totient is φ = 3255693120.

The previous prime is 12212213207. The next prime is 12212213227. The reversal of 12212213220 is 2231221221.

12212213220 is a `hidden beast` number, since 1 + 221 + 221 + 3 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12212213193 and 12212213202.

It is not an unprimeable number, because it can be changed into a prime (12212213227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 880701 + ... + 894459.

It is an arithmetic number, because the mean of its divisors is an integer number (514637760).

Almost surely, 2^12212213220 is an apocalyptic number.

12212213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212213220 is an abundant number, since it is smaller than the sum of its proper divisors (24841705500).

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

12212213220 is a wasteful number, since it uses less digits than its factorization.

12212213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18705 (or 18700 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12212213220 its reverse (2231221221), we get a palindrome (14443434441).

The spelling of 12212213220 in words is "twelve billion, two hundred twelve million, two hundred thirteen thousand, two hundred twenty".