2175021065 has 12 divisors (see below), whose sum is σ = 3036152196. Its totient is φ = 1491442848.

The previous prime is 2175021053. The next prime is 2175021073. The reversal of 2175021065 is 5601205712.

It can be written as a sum of positive squares in 2 ways, for example, as 875923216 + 1299097849 = 29596^2 + 36043^2 .

It is not a de Polignac number, because 2175021065 - 2⁶ = 2175021001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4438574 + ... + 4439063.

It is an arithmetic number, because the mean of its divisors is an integer number (253012683).

Almost surely, 2^2175021065 is an apocalyptic number.

It is an amenable number.

2175021065 is a deficient number, since it is larger than the sum of its proper divisors (861131131).

2175021065 is an equidigital number, since it uses as much as digits as its factorization.

2175021065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8877656 (or 8877649 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 2175021065 is about 46637.1211054027. The cubic root of 2175021065 is about 1295.6503672589.

Adding to 2175021065 its reverse (5601205712), we get a palindrome (7776226777).

The spelling of 2175021065 in words is "two billion, one hundred seventy-five million, twenty-one thousand, sixty-five".