2011112111221 has 4 divisors (see below), whose sum is σ = 2011230227500. Its totient is φ = 2010993994944.

The previous prime is 2011112111179. The next prime is 2011112111237. The reversal of 2011112111221 is 1221112111102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1314072468900 + 697039642321 = 1146330^2 + 834889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011112111221 - 2¹⁹ = 2011111586933 is a prime.

It is a super-2 number, since 2×2011112111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011112111195 and 2011112111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011112111291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59032596 + ... + 59066653.

It is an arithmetic number, because the mean of its divisors is an integer number (502807556875).

Almost surely, 2^{2011112111221} is an apocalyptic number.

It is an amenable number.

2011112111221 is a deficient number, since it is larger than the sum of its proper divisors (118116279).

2011112111221 is a wasteful number, since it uses less digits than its factorization.

2011112111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118116278.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 2011112111221 its reverse (1221112111102), we get a palindrome (3232224222323).

The spelling of 2011112111221 in words is "two trillion, eleven billion, one hundred twelve million, one hundred eleven thousand, two hundred twenty-one".