12221210000 has 100 divisors (see below), whose sum is σ = 29824852992. Its totient is φ = 4849488000.

The previous prime is 12221209997. The next prime is 12221210009. The reversal of 12221210000 is 1212221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (100).

It is not an unprimeable number, because it can be changed into a prime (12221210009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1265189 + ... + 1274811.

Almost surely, 2^12221210000 is an apocalyptic number.

12221210000 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 12221210000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14912426496).

12221210000 is an abundant number, since it is smaller than the sum of its proper divisors (17603642992).

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

12221210000 is an equidigital number, since it uses as much as digits as its factorization.

12221210000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778 (or 9757 counting only the distinct ones).

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

Adding to 12221210000 its reverse (1212221), we get a palindrome (12222422221).

The spelling of 12221210000 in words is "twelve billion, two hundred twenty-one million, two hundred ten thousand".