2001121110 has 24 divisors (see below), whose sum is σ = 5202915120. Its totient is φ = 533632272.

The previous prime is 2001121099. The next prime is 2001121117. The reversal of 2001121110 is 111211002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2001121092 and 2001121101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11117250 + ... + 11117429.

It is an arithmetic number, because the mean of its divisors is an integer number (216788130).

Almost surely, 2^2001121110 is an apocalyptic number.

2001121110 is an abundant number, since it is smaller than the sum of its proper divisors (3201794010).

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

2001121110 is a wasteful number, since it uses less digits than its factorization.

2001121110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22234692 (or 22234689 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2001121110 is about 44733.8921847854. The cubic root of 2001121110 is about 1260.1564242683.

Adding to 2001121110 its reverse (111211002), we get a palindrome (2112332112).

The spelling of 2001121110 in words is "two billion, one million, one hundred twenty-one thousand, one hundred ten".