2170550021687 has 4 divisors (see below), whose sum is σ = 2180283430080. Its totient is φ = 2160816613296.

The previous prime is 2170550021621. The next prime is 2170550021711. The reversal of 2170550021687 is 7861200550712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2170550021687 - 2⁴⁰ = 1071038393911 is a prime.

It is a super-2 number, since 2×2170550021687² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170550021287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4866703862 + ... + 4866704307.

It is an arithmetic number, because the mean of its divisors is an integer number (545070857520).

Almost surely, 2^{2170550021687} is an apocalyptic number.

2170550021687 is a deficient number, since it is larger than the sum of its proper divisors (9733408393).

2170550021687 is an equidigital number, since it uses as much as digits as its factorization.

2170550021687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9733408392.

The product of its (nonzero) digits is 235200, while the sum is 44.

The spelling of 2170550021687 in words is "two trillion, one hundred seventy billion, five hundred fifty million, twenty-one thousand, six hundred eighty-seven".