12211131220 has 12 divisors (see below), whose sum is σ = 25643375604. Its totient is φ = 4884452480.

The previous prime is 12211131217. The next prime is 12211131281. The reversal of 12211131220 is 2213111221.

It can be written as a sum of positive squares in 2 ways, for example, as 1989516816 + 10221614404 = 44604^2 + 101102^2 .

It is a super-2 number, since 2×12211131220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12211131194 and 12211131203.

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 3 ways as a sum of consecutive naturals, for example, 305278261 + ... + 305278300.

It is an arithmetic number, because the mean of its divisors is an integer number (2136947967).

Almost surely, 2^12211131220 is an apocalyptic number.

12211131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211131220 is an abundant number, since it is smaller than the sum of its proper divisors (13432244384).

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

12211131220 is a wasteful number, since it uses less digits than its factorization.

12211131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610556570 (or 610556568 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12211131220 its reverse (2213111221), we get a palindrome (14424242441).

The spelling of 12211131220 in words is "twelve billion, two hundred eleven million, one hundred thirty-one thousand, two hundred twenty".