12211012220 has 96 divisors (see below), whose sum is σ = 29273481216. Its totient is φ = 4238092800.

The previous prime is 12211012217. The next prime is 12211012241. The reversal of 12211012220 is 2221011221.

It is a junction number, because it is equal to n+sod(n) for n = 12211012195 and 12211012204.

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 31 ways as a sum of consecutive naturals, for example, 485597 + ... + 510123.

It is an arithmetic number, because the mean of its divisors is an integer number (304932096).

Almost surely, 2^12211012220 is an apocalyptic number.

12211012220 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 12211012220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14636740608).

12211012220 is an abundant number, since it is smaller than the sum of its proper divisors (17062468996).

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

12211012220 is a wasteful number, since it uses less digits than its factorization.

12211012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24651 (or 24649 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12211012220 its reverse (2221011221), we get a palindrome (14432023441).

Subtracting from 12211012220 its reverse (2221011221), we obtain a palindrome (9990000999).

The spelling of 12211012220 in words is "twelve billion, two hundred eleven million, twelve thousand, two hundred twenty".