21234383585 has 4 divisors (see below), whose sum is σ = 25481260308. Its totient is φ = 16987506864.

The previous prime is 21234383507. The next prime is 21234383623. The reversal of 21234383585 is 58538343212.

It is a happy number.

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 13306083904 + 7928299681 = 115352^2 + 89041^2 .

It is a cyclic number.

It is not a de Polignac number, because 21234383585 - 2⁸ = 21234383329 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123438354 + ... + 2123438363.

It is an arithmetic number, because the mean of its divisors is an integer number (6370315077).

Almost surely, 2^21234383585 is an apocalyptic number.

It is an amenable number.

21234383585 is a deficient number, since it is larger than the sum of its proper divisors (4246876723).

21234383585 is an equidigital number, since it uses as much as digits as its factorization.

21234383585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4246876722.

The product of its digits is 691200, while the sum is 44.

The spelling of 21234383585 in words is "twenty-one billion, two hundred thirty-four million, three hundred eighty-three thousand, five hundred eighty-five".