2001110111221 has 32 divisors (see below), whose sum is σ = 2257073891072. Its totient is φ = 1762225113600.

The previous prime is 2001110111213. The next prime is 2001110111227. The reversal of 2001110111221 is 1221110111002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2001110111221 - 2³ = 2001110111213 is a prime.

It is a super-2 number, since 2×2001110111221² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001110111227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3965071 + ... + 4441171.

It is an arithmetic number, because the mean of its divisors is an integer number (70533559096).

Almost surely, 2^{2001110111221} is an apocalyptic number.

It is an amenable number.

2001110111221 is a deficient number, since it is larger than the sum of its proper divisors (255963779851).

2001110111221 is a wasteful number, since it uses less digits than its factorization.

2001110111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476333.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2001110111221 its reverse (1221110111002), we get a palindrome (3222220222223).

The spelling of 2001110111221 in words is "two trillion, one billion, one hundred ten million, one hundred eleven thousand, two hundred twenty-one".