2113105221 has 6 divisors (see below), whose sum is σ = 3052263110. Its totient is φ = 1408736808.

The previous prime is 2113105157. The next prime is 2113105223. The reversal of 2113105221 is 1225013112.

It can be written as a sum of positive squares in only one way, i.e., 1251036900 + 862068321 = 35370^2 + 29361^2 .

It is not a de Polignac number, because 2113105221 - 2⁶ = 2113105157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2113105194 and 2113105203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2113105223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117394726 + ... + 117394743.

Almost surely, 2^2113105221 is an apocalyptic number.

It is an amenable number.

2113105221 is a deficient number, since it is larger than the sum of its proper divisors (939157889).

2113105221 is a wasteful number, since it uses less digits than its factorization.

2113105221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234789475 (or 234789472 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 2113105221 is about 45968.5242421377. The cubic root of 2113105221 is about 1283.2374956411.

Adding to 2113105221 its reverse (1225013112), we get a palindrome (3338118333).

The spelling of 2113105221 in words is "two billion, one hundred thirteen million, one hundred five thousand, two hundred twenty-one".