2181113 has 16 divisors (see below), whose sum is σ = 2560896. Its totient is φ = 1837440.

The previous prime is 2181097. The next prime is 2181131. The reversal of 2181113 is 3111812.

It is not a de Polignac number, because 2181113 - 2⁴ = 2181097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2181091 and 2181100.

It is not an unprimeable number, because it can be changed into a prime (2181173) 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, 9245 + ... + 9477.

It is an arithmetic number, because the mean of its divisors is an integer number (160056).

2^2181113 is an apocalyptic number.

2181113 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2181113 is a deficient number, since it is larger than the sum of its proper divisors (379783).

2181113 is a wasteful number, since it uses less digits than its factorization.

2181113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304.

The product of its digits is 48, while the sum is 17.

The square root of 2181113 is about 1476.8591672871. The cubic root of 2181113 is about 129.6858885850.

Adding to 2181113 its reverse (3111812), we get a palindrome (5292925).

It can be divided in two parts, 218 and 1113, that added together give a palindrome (1331).

The spelling of 2181113 in words is "two million, one hundred eighty-one thousand, one hundred thirteen".