2001132120 has 128 divisors (see below), whose sum is σ = 6494826240. Its totient is φ = 490329600.

The previous prime is 2001132103. The next prime is 2001132139. The reversal of 2001132120 is 212311002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2001132096 and 2001132105.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351295 + ... + 356945.

It is an arithmetic number, because the mean of its divisors is an integer number (50740830).

Almost surely, 2^2001132120 is an apocalyptic number.

2001132120 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 2001132120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3247413120).

2001132120 is an abundant number, since it is smaller than the sum of its proper divisors (4493694120).

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

2001132120 is a wasteful number, since it uses less digits than its factorization.

2001132120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905 (or 5901 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2001132120 is about 44734.0152456718. The cubic root of 2001132120 is about 1260.1587353556.

Adding to 2001132120 its reverse (212311002), we get a palindrome (2213443122).

The spelling of 2001132120 in words is "two billion, one million, one hundred thirty-two thousand, one hundred twenty".