1200323311220 has 72 divisors (see below), whose sum is σ = 2777332398624. Its totient is φ = 432158800000.

The previous prime is 1200323311211. The next prime is 1200323311241. The reversal of 1200323311220 is 221133230021.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1200323311192 and 1200323311201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1976795 + ... + 2511645.

It is an arithmetic number, because the mean of its divisors is an integer number (38574061092).

Almost surely, 2^{1200323311220} is an apocalyptic number.

1200323311220 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 1200323311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1388666199312).

1200323311220 is an abundant number, since it is smaller than the sum of its proper divisors (1577009087404).

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

1200323311220 is a wasteful number, since it uses less digits than its factorization.

1200323311220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535073 (or 534970 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 1200323311220 its reverse (221133230021), we get a palindrome (1421456541241).

The spelling of 1200323311220 in words is "one trillion, two hundred billion, three hundred twenty-three million, three hundred eleven thousand, two hundred twenty".