21670338371673 has 16 divisors (see below), whose sum is σ = 30594469452480. Its totient is φ = 13596608134656.

The previous prime is 21670338371659. The next prime is 21670338371743. The reversal of 21670338371673 is 37617383307612.

It is not a de Polignac number, because 21670338371673 - 2¹⁷ = 21670338240601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21670338371173) 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, 5792940 + ... + 8769197.

It is an arithmetic number, because the mean of its divisors is an integer number (1912154340780).

Almost surely, 2^{21670338371673} is an apocalyptic number.

It is an amenable number.

21670338371673 is a deficient number, since it is larger than the sum of its proper divisors (8924131080807).

21670338371673 is a wasteful number, since it uses less digits than its factorization.

21670338371673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14591336.

The product of its (nonzero) digits is 16003008, while the sum is 57.

The spelling of 21670338371673 in words is "twenty-one trillion, six hundred seventy billion, three hundred thirty-eight million, three hundred seventy-one thousand, six hundred seventy-three".