21365322663 has 8 divisors (see below), whose sum is σ = 28489201776. Its totient is φ = 14242496000.

The previous prime is 21365322619. The next prime is 21365322683. The reversal of 21365322663 is 36622356312.

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 21365322663 - 2⁶ = 21365322599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365322683) 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, 214458 + ... + 297863.

It is an arithmetic number, because the mean of its divisors is an integer number (3561150222).

Almost surely, 2^21365322663 is an apocalyptic number.

21365322663 is a deficient number, since it is larger than the sum of its proper divisors (7123879113).

21365322663 is a wasteful number, since it uses less digits than its factorization.

21365322663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526225.

The product of its digits is 233280, while the sum is 39.

Adding to 21365322663 its reverse (36622356312), we get a palindrome (57987678975).

The spelling of 21365322663 in words is "twenty-one billion, three hundred sixty-five million, three hundred twenty-two thousand, six hundred sixty-three".