12321122220 has 240 divisors, whose sum is σ = 42883948800. Its totient is φ = 2936062080.

The previous prime is 12321122189. The next prime is 12321122251. The reversal of 12321122220 is 2222112321.

12321122220 is a `hidden beast` number, since 1 + 2 + 321 + 122 + 220 = 666.

It is an interprime number because it is at equal distance from previous prime (12321122189) and next prime (12321122251).

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

It is a junction number, because it is equal to n+sod(n) for n = 12321122193 and 12321122202.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1045521 + ... + 1057239.

It is an arithmetic number, because the mean of its divisors is an integer number (178683120).

Almost surely, 2^12321122220 is an apocalyptic number.

12321122220 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 12321122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21441974400).

12321122220 is an abundant number, since it is smaller than the sum of its proper divisors (30562826580).

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

12321122220 is a wasteful number, since it uses less digits than its factorization.

12321122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11810 (or 11799 counting only the distinct ones).

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

Adding to 12321122220 its reverse (2222112321), we get a palindrome (14543234541).

The spelling of 12321122220 in words is "twelve billion, three hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".