21326560067 has 4 divisors (see below), whose sum is σ = 22061958720. Its totient is φ = 20591161416.

The previous prime is 21326560049. The next prime is 21326560069. The reversal of 21326560067 is 76006562312.

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 21326560067 - 2²⁰ = 21325511491 is a prime.

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 21326560067.

It is not an unprimeable number, because it can be changed into a prime (21326560069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367699283 + ... + 367699340.

It is an arithmetic number, because the mean of its divisors is an integer number (5515489680).

Almost surely, 2^21326560067 is an apocalyptic number.

21326560067 is a deficient number, since it is larger than the sum of its proper divisors (735398653).

21326560067 is an equidigital number, since it uses as much as digits as its factorization.

21326560067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735398652.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 21326560067 in words is "twenty-one billion, three hundred twenty-six million, five hundred sixty thousand, sixty-seven".