2171252872 has 8 divisors (see below), whose sum is σ = 4071099150. Its totient is φ = 1085626432.

The previous prime is 2171252861. The next prime is 2171252887. The reversal of 2171252872 is 2782521712.

It can be written as a sum of positive squares in only one way, i.e., 2162808036 + 8444836 = 46506^2 + 2906^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135703297 + ... + 135703312.

Almost surely, 2^2171252872 is an apocalyptic number.

It is an amenable number.

2171252872 is a deficient number, since it is larger than the sum of its proper divisors (1899846278).

2171252872 is a wasteful number, since it uses less digits than its factorization.

2171252872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271406615 (or 271406611 counting only the distinct ones).

The product of its digits is 31360, while the sum is 37.

The square root of 2171252872 is about 46596.7045186674. The cubic root of 2171252872 is about 1294.9017028096.

The spelling of 2171252872 in words is "two billion, one hundred seventy-one million, two hundred fifty-two thousand, eight hundred seventy-two".