21436275329 has 4 divisors (see below), whose sum is σ = 24498600384. Its totient is φ = 18373950276.

The previous prime is 21436275319. The next prime is 21436275349. The reversal of 21436275329 is 92357263412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21436275329 - 2²⁰ = 21435226753 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 21436275329.

It is not an unprimeable number, because it can be changed into a prime (21436275319) 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 3 ways as a sum of consecutive naturals, for example, 1531162517 + ... + 1531162530.

It is an arithmetic number, because the mean of its divisors is an integer number (6124650096).

Almost surely, 2^21436275329 is an apocalyptic number.

It is an amenable number.

21436275329 is a deficient number, since it is larger than the sum of its proper divisors (3062325055).

21436275329 is an equidigital number, since it uses as much as digits as its factorization.

21436275329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3062325054.

The product of its digits is 544320, while the sum is 44.

The spelling of 21436275329 in words is "twenty-one billion, four hundred thirty-six million, two hundred seventy-five thousand, three hundred twenty-nine".