12221000021220 has 192 divisors, whose sum is σ = 35236950739200. Its totient is φ = 3163454300160.

The previous prime is 12221000021201. The next prime is 12221000021221. The reversal of 12221000021220 is 2212000012221.

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 12221000021220.

It is not an unprimeable number, because it can be changed into a prime (12221000021221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 238474800 + ... + 238526040.

It is an arithmetic number, because the mean of its divisors is an integer number (183525785100).

Almost surely, 2^{12221000021220} is an apocalyptic number.

12221000021220 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 12221000021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17618475369600).

12221000021220 is an abundant number, since it is smaller than the sum of its proper divisors (23015950717980).

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

12221000021220 is a wasteful number, since it uses less digits than its factorization.

12221000021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52158 (or 52156 counting only the distinct ones).

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

Adding to 12221000021220 its reverse (2212000012221), we get a palindrome (14433000033441).

The spelling of 12221000021220 in words is "twelve trillion, two hundred twenty-one billion, twenty-one thousand, two hundred twenty".