2001123102220 has 144 divisors (see below), whose sum is σ = 4916340098208. Its totient is φ = 676199147520.

The previous prime is 2001123102211. The next prime is 2001123102239. The reversal of 2001123102220 is 222013211002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001123102194 and 2001123102203.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23298474 + ... + 23384206.

It is an arithmetic number, because the mean of its divisors is an integer number (34141250682).

Almost surely, 2^{2001123102220} is an apocalyptic number.

2001123102220 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 2001123102220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2458170049104).

2001123102220 is an abundant number, since it is smaller than the sum of its proper divisors (2915216995988).

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

2001123102220 is a wasteful number, since it uses less digits than its factorization.

2001123102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85928 (or 85847 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 2001123102220 its reverse (222013211002), we get a palindrome (2223136313222).

The spelling of 2001123102220 in words is "two trillion, one billion, one hundred twenty-three million, one hundred two thousand, two hundred twenty".