12321221000 has 128 divisors (see below), whose sum is σ = 31517665920. Its totient is φ = 4471200000.

The previous prime is 12321220997. The next prime is 12321221069. The reversal of 12321221000 is 12212321.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7600190 + ... + 7601810.

It is an arithmetic number, because the mean of its divisors is an integer number (246231765).

Almost surely, 2^12321221000 is an apocalyptic number.

12321221000 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 12321221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15758832960).

12321221000 is an abundant number, since it is smaller than the sum of its proper divisors (19196444920).

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

12321221000 is a wasteful number, since it uses less digits than its factorization.

12321221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344 (or 2330 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 12321221000 its reverse (12212321), we get a palindrome (12333433321).

The spelling of 12321221000 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-one thousand".