2001221110 has 16 divisors (see below), whose sum is σ = 4116797856. Its totient is φ = 686132928.

The previous prime is 2001221077. The next prime is 2001221119. The reversal of 2001221110 is 111221002.

It is a super-2 number, since 2×2001221110² = 8009771862219264200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221119) 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, 14294367 + ... + 14294506.

It is an arithmetic number, because the mean of its divisors is an integer number (257299866).

Almost surely, 2^2001221110 is an apocalyptic number.

2001221110 is an abundant number, since it is smaller than the sum of its proper divisors (2115576746).

2001221110 is a wasteful number, since it uses less digits than its factorization.

2001221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28588887.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2001221110 is about 44735.0098915827. The cubic root of 2001221110 is about 1260.1774147592.

Adding to 2001221110 its reverse (111221002), we get a palindrome (2112442112).

The spelling of 2001221110 in words is "two billion, one million, two hundred twenty-one thousand, one hundred ten".