1323221210220 has 192 divisors, whose sum is σ = 4566713195520. Its totient is φ = 278775585792.

The previous prime is 1323221210219. The next prime is 1323221210263. The reversal of 1323221210220 is 220121223231.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3551766 + ... + 3906594.

It is an arithmetic number, because the mean of its divisors is an integer number (23784964560).

Almost surely, 2^{1323221210220} is an apocalyptic number.

1323221210220 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 1323221210220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2283356597760).

1323221210220 is an abundant number, since it is smaller than the sum of its proper divisors (3243491985300).

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

1323221210220 is a wasteful number, since it uses less digits than its factorization.

1323221210220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355544 (or 355542 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 1323221210220 its reverse (220121223231), we get a palindrome (1543342433451).

The spelling of 1323221210220 in words is "one trillion, three hundred twenty-three billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty".