2001022120 has 32 divisors (see below), whose sum is σ = 4503656520. Its totient is φ = 800167680.

The previous prime is 2001022117. The next prime is 2001022129. The reversal of 2001022120 is 212201002.

It can be written as a sum of positive squares in 4 ways, for example, as 1104498756 + 896523364 = 33234^2 + 29942^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2001022097 and 2001022106.

It is not an unprimeable number, because it can be changed into a prime (2001022129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192250 + ... + 202390.

Almost surely, 2^2001022120 is an apocalyptic number.

2001022120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001022120 is an abundant number, since it is smaller than the sum of its proper divisors (2502634400).

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

2001022120 is a wasteful number, since it uses less digits than its factorization.

2001022120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15085 (or 15081 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 2001022120 is about 44732.7857393210. The cubic root of 2001022120 is about 1260.1356450926.

Adding to 2001022120 its reverse (212201002), we get a palindrome (2213223122).

The spelling of 2001022120 in words is "two billion, one million, twenty-two thousand, one hundred twenty".