2171891707 has 16 divisors (see below), whose sum is σ = 2213291520. Its totient is φ = 2131067232.

The previous prime is 2171891677. The next prime is 2171891723. The reversal of 2171891707 is 7071981712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171891707 is a prime.

It is a super-2 number, since 2×2171891707² = 9434227173870747698, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2171891737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7674388 + ... + 7674670.

It is an arithmetic number, because the mean of its divisors is an integer number (138330720).

Almost surely, 2^2171891707 is an apocalyptic number.

2171891707 is a deficient number, since it is larger than the sum of its proper divisors (41399813).

2171891707 is a wasteful number, since it uses less digits than its factorization.

2171891707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882.

The product of its (nonzero) digits is 49392, while the sum is 43.

The square root of 2171891707 is about 46603.5589520800. The cubic root of 2171891707 is about 1295.0286874679.

The spelling of 2171891707 in words is "two billion, one hundred seventy-one million, eight hundred ninety-one thousand, seven hundred seven".