2001001122220 has 48 divisors (see below), whose sum is σ = 4307094011808. Its totient is φ = 780424727040.

The previous prime is 2001001122161. The next prime is 2001001122223. The reversal of 2001001122220 is 222211001002.

It is a happy number.

It is a super-2 number, since 2×2001001122220² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2001001122220.

It is not an unprimeable number, because it can be changed into a prime (2001001122223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 704722 + ... + 2120998.

It is an arithmetic number, because the mean of its divisors is an integer number (89731125246).

Almost surely, 2^{2001001122220} is an apocalyptic number.

2001001122220 is a gapful number since it is divisible by the number (20) 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 2001001122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2153547005904).

2001001122220 is an abundant number, since it is smaller than the sum of its proper divisors (2306092889588).

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

2001001122220 is a wasteful number, since it uses less digits than its factorization.

2001001122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1418050 (or 1418048 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001001122220 its reverse (222211001002), we get a palindrome (2223212123222).

The spelling of 2001001122220 in words is "two trillion, one billion, one million, one hundred twenty-two thousand, two hundred twenty".