2170989973879 has 4 divisors (see below), whose sum is σ = 2173116311800. Its totient is φ = 2168863635960.

The previous prime is 2170989973799. The next prime is 2170989973891. The reversal of 2170989973879 is 9783799890712.

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 2170989973879 - 2²⁷ = 2170855756151 is a prime.

It is a super-3 number, since 3×2170989973879³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2170989973799 and 2170989973808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2170989973379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063167429 + ... + 1063169470.

It is an arithmetic number, because the mean of its divisors is an integer number (543279077950).

Almost surely, 2^{2170989973879} is an apocalyptic number.

2170989973879 is a deficient number, since it is larger than the sum of its proper divisors (2126337921).

2170989973879 is a wasteful number, since it uses less digits than its factorization.

2170989973879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126337920.

The product of its (nonzero) digits is 864162432, while the sum is 79.

The spelling of 2170989973879 in words is "two trillion, one hundred seventy billion, nine hundred eighty-nine million, nine hundred seventy-three thousand, eight hundred seventy-nine".