12001221210 has 128 divisors (see below), whose sum is σ = 32606509824. Its totient is φ = 2801295360.

The previous prime is 12001221187. The next prime is 12001221217. The reversal of 12001221210 is 1212210021.

It is not an unprimeable number, because it can be changed into a prime (12001221217) 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, 1179304 + ... + 1189436.

It is an arithmetic number, because the mean of its divisors is an integer number (254738358).

Almost surely, 2^12001221210 is an apocalyptic number.

12001221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12001221210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16303254912).

12001221210 is an abundant number, since it is smaller than the sum of its proper divisors (20605288614).

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

12001221210 is a wasteful number, since it uses less digits than its factorization.

12001221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10288.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 12001221210 its reverse (1212210021), we get a palindrome (13213431231).

The spelling of 12001221210 in words is "twelve billion, one million, two hundred twenty-one thousand, two hundred ten".