2011111100221 has 16 divisors (see below), whose sum is σ = 2066074407936. Its totient is φ = 1956845419776.

The previous prime is 2011111100213. The next prime is 2011111100233. The reversal of 2011111100221 is 1220011111102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2011111100221 - 2³ = 2011111100213 is a prime.

It is a super-2 number, since 2×2011111100221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011111100261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2784901 + ... + 3431893.

It is an arithmetic number, because the mean of its divisors is an integer number (129129650496).

Almost surely, 2^{2011111100221} is an apocalyptic number.

It is an amenable number.

2011111100221 is a deficient number, since it is larger than the sum of its proper divisors (54963307715).

2011111100221 is a wasteful number, since it uses less digits than its factorization.

2011111100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647532.

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

Adding to 2011111100221 its reverse (1220011111102), we get a palindrome (3231122211323).

The spelling of 2011111100221 in words is "two trillion, eleven billion, one hundred eleven million, one hundred thousand, two hundred twenty-one".