21530782367 has 8 divisors (see below), whose sum is σ = 22279047120. Its totient is φ = 20793769920.

The previous prime is 21530782289. The next prime is 21530782393. The reversal of 21530782367 is 76328703512.

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 21530782367 - 2¹⁸ = 21530520223 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 (21530782397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2809184 + ... + 2816837.

It is an arithmetic number, because the mean of its divisors is an integer number (2784880890).

Almost surely, 2^21530782367 is an apocalyptic number.

21530782367 is a deficient number, since it is larger than the sum of its proper divisors (748264753).

21530782367 is an equidigital number, since it uses as much as digits as its factorization.

21530782367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5626153.

The product of its (nonzero) digits is 423360, while the sum is 44.

The spelling of 21530782367 in words is "twenty-one billion, five hundred thirty million, seven hundred eighty-two thousand, three hundred sixty-seven".