2001220110 has 384 divisors, whose sum is σ = 6222977280. Its totient is φ = 442810368.

The previous prime is 2001220103. The next prime is 2001220141. The reversal of 2001220110 is 110221002.

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 = 2001220092 and 2001220101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 37758844 + ... + 37758896.

It is an arithmetic number, because the mean of its divisors is an integer number (16205670).

Almost surely, 2^2001220110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001220110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3111488640).

2001220110 is an abundant number, since it is smaller than the sum of its proper divisors (4221757170).

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

2001220110 is a wasteful number, since it uses less digits than its factorization.

2001220110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2001220110 is about 44734.9987146529. The cubic root of 2001220110 is about 1260.1772048578.

Adding to 2001220110 its reverse (110221002), we get a palindrome (2111441112).

It can be divided in two parts, 2001 and 220110, that added together give a triangular number (222111 = T₆₆₆).

The spelling of 2001220110 in words is "two billion, one million, two hundred twenty thousand, one hundred ten".