2221718685173 has 16 divisors (see below), whose sum is σ = 2470665964032. Its totient is φ = 1983967128000.

The previous prime is 2221718685169. The next prime is 2221718685203. The reversal of 2221718685173 is 3715868171222.

It is not a de Polignac number, because 2221718685173 - 2² = 2221718685169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221718685143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189518 + ... + 2116448.

It is an arithmetic number, because the mean of its divisors is an integer number (154416622752).

Almost surely, 2^{2221718685173} is an apocalyptic number.

It is an amenable number.

2221718685173 is a deficient number, since it is larger than the sum of its proper divisors (248947278859).

2221718685173 is a wasteful number, since it uses less digits than its factorization.

2221718685173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929836.

The product of its digits is 2257920, while the sum is 53.

The spelling of 2221718685173 in words is "two trillion, two hundred twenty-one billion, seven hundred eighteen million, six hundred eighty-five thousand, one hundred seventy-three".