12321221202 has 64 divisors (see below), whose sum is σ = 27875145600. Its totient is φ = 4083869664.

The previous prime is 12321221201. The next prime is 12321221207. The reversal of 12321221202 is 20212212321.

It is a super-2 number, since 2×12321221202² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12321221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 775078 + ... + 790814.

It is an arithmetic number, because the mean of its divisors is an integer number (435549150).

Almost surely, 2^12321221202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12321221202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13937572800).

12321221202 is an abundant number, since it is smaller than the sum of its proper divisors (15553924398).

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

12321221202 is an equidigital number, since it uses as much as digits as its factorization.

12321221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15939 (or 15921 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12321221202 its reverse (20212212321), we get a palindrome (32533433523).

The spelling of 12321221202 in words is "twelve billion, three hundred twenty-one million, two hundred twenty-one thousand, two hundred two".