2181106043 has 4 divisors (see below), whose sum is σ = 2181378888. Its totient is φ = 2180833200.

The previous prime is 2181106003. The next prime is 2181106049. The reversal of 2181106043 is 3406011812.

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

It is a cyclic number.

It is not a de Polignac number, because 2181106043 - 2¹⁶ = 2181040507 is a prime.

It is a super-2 number, since 2×2181106043² = 9514447141622235698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2181106049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124058 + ... + 140543.

It is an arithmetic number, because the mean of its divisors is an integer number (545344722).

Almost surely, 2^2181106043 is an apocalyptic number.

2181106043 is a deficient number, since it is larger than the sum of its proper divisors (272845).

2181106043 is an equidigital number, since it uses as much as digits as its factorization.

2181106043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272844.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2181106043 is about 46702.3130369364. The cubic root of 2181106043 is about 1296.8575070040.

Adding to 2181106043 its reverse (3406011812), we get a palindrome (5587117855).

The spelling of 2181106043 in words is "two billion, one hundred eighty-one million, one hundred six thousand, forty-three".