2171853887 has 16 divisors (see below), whose sum is σ = 2632810752. Its totient is φ = 1748960640.

The previous prime is 2171853869. The next prime is 2171853889. The reversal of 2171853887 is 7883581712.

It is not a de Polignac number, because 2171853887 - 2⁶ = 2171853823 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2171853889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51968 + ... + 83930.

It is an arithmetic number, because the mean of its divisors is an integer number (164550672).

Almost surely, 2^2171853887 is an apocalyptic number.

2171853887 is a deficient number, since it is larger than the sum of its proper divisors (460956865).

2171853887 is a wasteful number, since it uses less digits than its factorization.

2171853887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32558.

The product of its digits is 752640, while the sum is 50.

The square root of 2171853887 is about 46603.1531873113. The cubic root of 2171853887 is about 1295.0211704772.

The spelling of 2171853887 in words is "two billion, one hundred seventy-one million, eight hundred fifty-three thousand, eight hundred eighty-seven".