21426844589 has 4 divisors (see below), whose sum is σ = 21550699356. Its totient is φ = 21302989824.

The previous prime is 21426844577. The next prime is 21426844601. The reversal of 21426844589 is 98544862412.

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

It is an interprime number because it is at equal distance from previous prime (21426844577) and next prime (21426844601).

It can be written as a sum of positive squares in 2 ways, for example, as 16143735364 + 5283109225 = 127058^2 + 72685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21426844589 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 21426844589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426844529) 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, 61927124 + ... + 61927469.

It is an arithmetic number, because the mean of its divisors is an integer number (5387674839).

Almost surely, 2^21426844589 is an apocalyptic number.

It is an amenable number.

21426844589 is a deficient number, since it is larger than the sum of its proper divisors (123854767).

21426844589 is a wasteful number, since it uses less digits than its factorization.

21426844589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123854766.

The product of its digits is 4423680, while the sum is 53.

The spelling of 21426844589 in words is "twenty-one billion, four hundred twenty-six million, eight hundred forty-four thousand, five hundred eighty-nine".