21672127867 has 48 divisors (see below), whose sum is σ = 26105872320. Its totient is φ = 17886375936.

The previous prime is 21672127847. The next prime is 21672127937. The reversal of 21672127867 is 76872127612.

It is not a de Polignac number, because 21672127867 - 2¹⁹ = 21671603579 is a prime.

It is a super-2 number, since 2×21672127867² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21672127867.

It is not an unprimeable number, because it can be changed into a prime (21672127817) 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 47 ways as a sum of consecutive naturals, for example, 10373359 + ... + 10375447.

It is an arithmetic number, because the mean of its divisors is an integer number (543872340).

Almost surely, 2^21672127867 is an apocalyptic number.

21672127867 is a deficient number, since it is larger than the sum of its proper divisors (4433744453).

21672127867 is a wasteful number, since it uses less digits than its factorization.

21672127867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2299 counting only the distinct ones).

The product of its digits is 790272, while the sum is 49.

The spelling of 21672127867 in words is "twenty-one billion, six hundred seventy-two million, one hundred twenty-seven thousand, eight hundred sixty-seven".