21672389678 has 16 divisors (see below), whose sum is σ = 34345097280. Its totient is φ = 10239924576.

The previous prime is 21672389663. The next prime is 21672389741. The reversal of 21672389678 is 87698327612.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3972401 + ... + 3977852.

It is an arithmetic number, because the mean of its divisors is an integer number (2146568580).

Almost surely, 2^21672389678 is an apocalyptic number.

21672389678 is a deficient number, since it is larger than the sum of its proper divisors (12672707602).

21672389678 is a wasteful number, since it uses less digits than its factorization.

21672389678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950331.

The product of its digits is 12192768, while the sum is 59.

The spelling of 21672389678 in words is "twenty-one billion, six hundred seventy-two million, three hundred eighty-nine thousand, six hundred seventy-eight".