21672347756889 has 16 divisors (see below), whose sum is σ = 29601430689600. Its totient is φ = 14095752503040.

The previous prime is 21672347756887. The next prime is 21672347756893. The reversal of 21672347756889 is 98865774327612.

It is a happy number.

It is not a de Polignac number, because 21672347756889 - 2¹ = 21672347756887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21672347756889.

It is not an unprimeable number, because it can be changed into a prime (21672347756887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25667562 + ... + 26498460.

It is an arithmetic number, because the mean of its divisors is an integer number (1850089418100).

Almost surely, 2^{21672347756889} is an apocalyptic number.

It is an amenable number.

21672347756889 is a deficient number, since it is larger than the sum of its proper divisors (7929082932711).

21672347756889 is a wasteful number, since it uses less digits than its factorization.

21672347756889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043000.

The product of its digits is 1706987520, while the sum is 75.

The spelling of 21672347756889 in words is "twenty-one trillion, six hundred seventy-two billion, three hundred forty-seven million, seven hundred fifty-six thousand, eight hundred eighty-nine".