1001331111220 has 96 divisors (see below), whose sum is σ = 2345024908800. Its totient is φ = 356029578240.

The previous prime is 1001331111169. The next prime is 1001331111223. The reversal of 1001331111220 is 221111331001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1001331111194 and 1001331111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001331111223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10800502 + ... + 10892818.

It is an arithmetic number, because the mean of its divisors is an integer number (24427342800).

Almost surely, 2^{1001331111220} is an apocalyptic number.

1001331111220 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 1001331111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172512454400).

1001331111220 is an abundant number, since it is smaller than the sum of its proper divisors (1343693797580).

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

1001331111220 is a wasteful number, since it uses less digits than its factorization.

1001331111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93433 (or 93431 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1001331111220 its reverse (221111331001), we get a palindrome (1222442442221).

The spelling of 1001331111220 in words is "one trillion, one billion, three hundred thirty-one million, one hundred eleven thousand, two hundred twenty".