12211212220 has 48 divisors (see below), whose sum is σ = 27017625600. Its totient is φ = 4623220800.

The previous prime is 12211212161. The next prime is 12211212257. The reversal of 12211212220 is 2221211221.

It is a happy number.

It is a super-2 number, since 2×12211212220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211212194 and 12211212203.

It is a congruent number.

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, 423421 + ... + 451339.

It is an arithmetic number, because the mean of its divisors is an integer number (562867200).

Almost surely, 2^12211212220 is an apocalyptic number.

12211212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211212220 is an abundant number, since it is smaller than the sum of its proper divisors (14806413380).

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

12211212220 is a wasteful number, since it uses less digits than its factorization.

12211212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29098 (or 29096 counting only the distinct ones).

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

Adding to 12211212220 its reverse (2221211221), we get a palindrome (14432423441).

Subtracting from 12211212220 its reverse (2221211221), we obtain a palindrome (9990000999).

The spelling of 12211212220 in words is "twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty".