2175821012 has 12 divisors (see below), whose sum is σ = 3827417076. Its totient is φ = 1082273280.

The previous prime is 2175821009. The next prime is 2175821059. The reversal of 2175821012 is 2101285712.

It can be written as a sum of positive squares in 2 ways, for example, as 452242756 + 1723578256 = 21266^2 + 41516^2 .

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, 1408439 + ... + 1409982.

It is an arithmetic number, because the mean of its divisors is an integer number (318951423).

Almost surely, 2^2175821012 is an apocalyptic number.

It is an amenable number.

2175821012 is a deficient number, since it is larger than the sum of its proper divisors (1651596064).

2175821012 is a wasteful number, since it uses less digits than its factorization.

2175821012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818618 (or 2818616 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 2175821012 is about 46645.6966075114. The cubic root of 2175821012 is about 1295.8091894119.

The spelling of 2175821012 in words is "two billion, one hundred seventy-five million, eight hundred twenty-one thousand, twelve".