21067684259 has 4 divisors (see below), whose sum is σ = 21794156160. Its totient is φ = 20341212360.

The previous prime is 21067684241. The next prime is 21067684273. The reversal of 21067684259 is 95248676012.

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 21067684259 - 2²⁸ = 20799248803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21067384259) 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, 363235907 + ... + 363235964.

It is an arithmetic number, because the mean of its divisors is an integer number (5448539040).

Almost surely, 2^21067684259 is an apocalyptic number.

21067684259 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21067684259 is a deficient number, since it is larger than the sum of its proper divisors (726471901).

21067684259 is an equidigital number, since it uses as much as digits as its factorization.

21067684259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726471900.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 21067684259 in words is "twenty-one billion, sixty-seven million, six hundred eighty-four thousand, two hundred fifty-nine".