21704452263 has 24 divisors (see below), whose sum is σ = 33775297920. Its totient is φ = 13351515840.

The previous prime is 21704452243. The next prime is 21704452309. The reversal of 21704452263 is 36225440712.

21704452263 is a `hidden beast` number, since 2 + 1 + 70 + 4 + 4 + 522 + 63 = 666.

It is not a de Polignac number, because 21704452263 - 2⁹ = 21704451751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704452243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 286858 + ... + 354536.

It is an arithmetic number, because the mean of its divisors is an integer number (1407304080).

Almost surely, 2^21704452263 is an apocalyptic number.

21704452263 is a deficient number, since it is larger than the sum of its proper divisors (12070845657).

21704452263 is a wasteful number, since it uses less digits than its factorization.

21704452263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70439 (or 70436 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

Adding to 21704452263 its reverse (36225440712), we get a palindrome (57929892975).

The spelling of 21704452263 in words is "twenty-one billion, seven hundred four million, four hundred fifty-two thousand, two hundred sixty-three".