12220121000 has 64 divisors (see below), whose sum is σ = 28635310080. Its totient is φ = 4881172800.

The previous prime is 12220120973. The next prime is 12220121041. The reversal of 12220121000 is 12102221.

It is a happy 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, 734777 + ... + 751223.

It is an arithmetic number, because the mean of its divisors is an integer number (447426720).

Almost surely, 2^12220121000 is an apocalyptic number.

12220121000 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 12220121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14317655040).

12220121000 is an abundant number, since it is smaller than the sum of its proper divisors (16415189080).

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

12220121000 is a wasteful number, since it uses less digits than its factorization.

12220121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17211 (or 17197 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12220121000 its reverse (12102221), we get a palindrome (12232223221).

The spelling of 12220121000 in words is "twelve billion, two hundred twenty million, one hundred twenty-one thousand".