2113543521 has 6 divisors (see below), whose sum is σ = 3052896210. Its totient is φ = 1409029008.

The previous prime is 2113543493. The next prime is 2113543529. The reversal of 2113543521 is 1253453112.

2113543521 is a `hidden beast` number, since 2 + 1 + 135 + 4 + 3 + 521 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1767025296 + 346518225 = 42036^2 + 18615^2 .

It is not a de Polignac number, because 2113543521 - 2¹⁵ = 2113510753 is a prime.

It is a super-2 number, since 2×2113543521² = 8934132430322154882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2113543529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117419076 + ... + 117419093.

It is an arithmetic number, because the mean of its divisors is an integer number (508816035).

Almost surely, 2^2113543521 is an apocalyptic number.

It is an amenable number.

2113543521 is a deficient number, since it is larger than the sum of its proper divisors (939352689).

2113543521 is a wasteful number, since it uses less digits than its factorization.

2113543521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234838175 (or 234838172 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2113543521 is about 45973.2913875002. The cubic root of 2113543521 is about 1283.3262124902.

Adding to 2113543521 its reverse (1253453112), we get a palindrome (3366996633).

The spelling of 2113543521 in words is "two billion, one hundred thirteen million, five hundred forty-three thousand, five hundred twenty-one".