21240589517 has 8 divisors (see below), whose sum is σ = 25058022912. Its totient is φ = 17618922000.

The previous prime is 21240589481. The next prime is 21240589523. The reversal of 21240589517 is 71598504212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21240589517 - 2⁸ = 21240589261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240589597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48941234 + ... + 48941667.

It is an arithmetic number, because the mean of its divisors is an integer number (3132252864).

Almost surely, 2^21240589517 is an apocalyptic number.

It is an amenable number.

21240589517 is a deficient number, since it is larger than the sum of its proper divisors (3817433395).

21240589517 is an equidigital number, since it uses as much as digits as its factorization.

21240589517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97882939.

The product of its (nonzero) digits is 201600, while the sum is 44.

The spelling of 21240589517 in words is "twenty-one billion, two hundred forty million, five hundred eighty-nine thousand, five hundred seventeen".