1001320111220 has 96 divisors (see below), whose sum is σ = 2490807062016. Its totient is φ = 336107333760.

The previous prime is 1001320111111. The next prime is 1001320111237. The reversal of 1001320111220 is 221110231001.

It is a junction number, because it is equal to n+sod(n) for n = 1001320111195 and 1001320111204.

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, 1100684 + ... + 1792803.

It is an arithmetic number, because the mean of its divisors is an integer number (25945906896).

Almost surely, 2^{1001320111220} is an apocalyptic number.

1001320111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001320111220 is an abundant number, since it is smaller than the sum of its proper divisors (1489486950796).

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

1001320111220 is a wasteful number, since it uses less digits than its factorization.

1001320111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2893542 (or 2893518 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1001320111220 its reverse (221110231001), we get a palindrome (1222430342221).

The spelling of 1001320111220 in words is "one trillion, one billion, three hundred twenty million, one hundred eleven thousand, two hundred twenty".