2171511005 has 4 divisors (see below), whose sum is σ = 2605813212. Its totient is φ = 1737208800.

The previous prime is 2171510987. The next prime is 2171511053. The reversal of 2171511005 is 5001151712.

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 1540798009 + 630712996 = 39253^2 + 25114^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2171511005 is a prime.

It is a super-2 number, since 2×2171511005² = 9430920089672220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217151096 + ... + 217151105.

It is an arithmetic number, because the mean of its divisors is an integer number (651453303).

Almost surely, 2^2171511005 is an apocalyptic number.

It is an amenable number.

2171511005 is a deficient number, since it is larger than the sum of its proper divisors (434302207).

2171511005 is an equidigital number, since it uses as much as digits as its factorization.

2171511005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434302206.

The product of its (nonzero) digits is 350, while the sum is 23.

The square root of 2171511005 is about 46599.4742996099. The cubic root of 2171511005 is about 1294.9530162886.

Adding to 2171511005 its reverse (5001151712), we get a palindrome (7172662717).

The spelling of 2171511005 in words is "two billion, one hundred seventy-one million, five hundred eleven thousand, five".