12221012220 has 24 divisors (see below), whose sum is σ = 34218834384. Its totient is φ = 3258936576.

The previous prime is 12221012137. The next prime is 12221012227. The reversal of 12221012220 is 2221012221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12221012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221012227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101841709 + ... + 101841828.

It is an arithmetic number, because the mean of its divisors is an integer number (1425784766).

Almost surely, 2^12221012220 is an apocalyptic number.

12221012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221012220 is an abundant number, since it is smaller than the sum of its proper divisors (21997822164).

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

12221012220 is a wasteful number, since it uses less digits than its factorization.

12221012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203683549 (or 203683547 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12221012220 its reverse (2221012221), we get a palindrome (14442024441).

Subtracting from 12221012220 its reverse (2221012221), we obtain a palindrome (9999999999).

The spelling of 12221012220 in words is "twelve billion, two hundred twenty-one million, twelve thousand, two hundred twenty".