2175821011 has 16 divisors (see below), whose sum is σ = 2680784064. Its totient is φ = 1719696384.

The previous prime is 2175821009. The next prime is 2175821059. The reversal of 2175821011 is 1101285712.

It is not a de Polignac number, because 2175821011 - 2¹ = 2175821009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2175821111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 76671 + ... + 101143.

It is an arithmetic number, because the mean of its divisors is an integer number (167549004).

Almost surely, 2^2175821011 is an apocalyptic number.

2175821011 is a deficient number, since it is larger than the sum of its proper divisors (504963053).

2175821011 is a wasteful number, since it uses less digits than its factorization.

2175821011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25470.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 2175821011 is about 46645.6965967923. The cubic root of 2175821011 is about 1295.8091892134.

The spelling of 2175821011 in words is "two billion, one hundred seventy-five million, eight hundred twenty-one thousand, eleven".