2156110205 has 4 divisors (see below), whose sum is σ = 2587332252. Its totient is φ = 1724888160.

The previous prime is 2156110199. The next prime is 2156110237. The reversal of 2156110205 is 5020116512.

It is a happy number.

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 677092441 + 1479017764 = 26021^2 + 38458^2 .

It is not a de Polignac number, because 2156110205 - 2⁴ = 2156110189 is a prime.

It is a super-2 number, since 2×2156110205² = 9297622432210284050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215611016 + ... + 215611025.

It is an arithmetic number, because the mean of its divisors is an integer number (646833063).

Almost surely, 2^2156110205 is an apocalyptic number.

It is an amenable number.

2156110205 is a deficient number, since it is larger than the sum of its proper divisors (431222047).

2156110205 is an equidigital number, since it uses as much as digits as its factorization.

2156110205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431222046.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 2156110205 is about 46433.9337661586. The cubic root of 2156110205 is about 1291.8843932014.

Adding to 2156110205 its reverse (5020116512), we get a palindrome (7176226717).

The spelling of 2156110205 in words is "two billion, one hundred fifty-six million, one hundred ten thousand, two hundred five".