21067552079 has 4 divisors (see below), whose sum is σ = 24077202384. Its totient is φ = 18057901776.

The previous prime is 21067552069. The next prime is 21067552081. The reversal of 21067552079 is 97025576012.

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 21067552079 - 2²⁰ = 21066503503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21067552069) 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, 1504825142 + ... + 1504825155.

It is an arithmetic number, because the mean of its divisors is an integer number (6019300596).

Almost surely, 2^21067552079 is an apocalyptic number.

21067552079 is a deficient number, since it is larger than the sum of its proper divisors (3009650305).

21067552079 is an equidigital number, since it uses as much as digits as its factorization.

21067552079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3009650304.

The product of its (nonzero) digits is 264600, while the sum is 44.

The spelling of 21067552079 in words is "twenty-one billion, sixty-seven million, five hundred fifty-two thousand, seventy-nine".