21872886589 has 4 divisors (see below), whose sum is σ = 22464045724. Its totient is φ = 21281727456.

The previous prime is 21872886551. The next prime is 21872886661. The reversal of 21872886589 is 98568827812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19826048025 + 2046838564 = 140805^2 + 45242^2 .

It is a cyclic number.

It is not a de Polignac number, because 21872886589 - 2¹⁹ = 21872362301 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 21872886589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21872886509) 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, 295579512 + ... + 295579585.

It is an arithmetic number, because the mean of its divisors is an integer number (5616011431).

Almost surely, 2^21872886589 is an apocalyptic number.

It is an amenable number.

21872886589 is a deficient number, since it is larger than the sum of its proper divisors (591159135).

21872886589 is an equidigital number, since it uses as much as digits as its factorization.

21872886589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591159134.

The product of its digits is 30965760, while the sum is 64.

The spelling of 21872886589 in words is "twenty-one billion, eight hundred seventy-two million, eight hundred eighty-six thousand, five hundred eighty-nine".