1220323112120 has 128 divisors (see below), whose sum is σ = 3197010556800. Its totient is φ = 410557593600.

The previous prime is 1220323112119. The next prime is 1220323112147. The reversal of 1220323112120 is 212113230221.

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 = 1220323112092 and 1220323112101.

It is a congruent number.

It is an unprimeable number.

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, 7105826 + ... + 7275534.

It is an arithmetic number, because the mean of its divisors is an integer number (24976644975).

Almost surely, 2^{1220323112120} is an apocalyptic number.

1220323112120 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 1220323112120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598505278400).

1220323112120 is an abundant number, since it is smaller than the sum of its proper divisors (1976687444680).

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

1220323112120 is a wasteful number, since it uses less digits than its factorization.

1220323112120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170209 (or 170205 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1220323112120 its reverse (212113230221), we get a palindrome (1432436342341).

The spelling of 1220323112120 in words is "one trillion, two hundred twenty billion, three hundred twenty-three million, one hundred twelve thousand, one hundred twenty".