21467981467 has 4 divisors (see below), whose sum is σ = 22208256720. Its totient is φ = 20727706216.

The previous prime is 21467981453. The next prime is 21467981473. The reversal of 21467981467 is 76418976412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21467981467 - 2¹⁵ = 21467948699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21467981407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370137583 + ... + 370137640.

It is an arithmetic number, because the mean of its divisors is an integer number (5552064180).

Almost surely, 2^21467981467 is an apocalyptic number.

21467981467 is a deficient number, since it is larger than the sum of its proper divisors (740275253).

21467981467 is an equidigital number, since it uses as much as digits as its factorization.

21467981467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740275252.

The product of its digits is 4064256, while the sum is 55.

The spelling of 21467981467 in words is "twenty-one billion, four hundred sixty-seven million, nine hundred eighty-one thousand, four hundred sixty-seven".