21716980633 has 4 divisors (see below), whose sum is σ = 22994450100. Its totient is φ = 20439511168.

The previous prime is 21716980619. The next prime is 21716980661. The reversal of 21716980633 is 33608961712.

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 18582324489 + 3134656144 = 136317^2 + 55988^2 .

It is a cyclic number.

It is not a de Polignac number, because 21716980633 - 2²⁹ = 21180109721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21716920633) 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 3 ways as a sum of consecutive naturals, for example, 638734708 + ... + 638734741.

It is an arithmetic number, because the mean of its divisors is an integer number (5748612525).

Almost surely, 2^21716980633 is an apocalyptic number.

It is an amenable number.

21716980633 is a deficient number, since it is larger than the sum of its proper divisors (1277469467).

21716980633 is a wasteful number, since it uses less digits than its factorization.

21716980633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277469466.

The product of its (nonzero) digits is 326592, while the sum is 46.

The spelling of 21716980633 in words is "twenty-one billion, seven hundred sixteen million, nine hundred eighty thousand, six hundred thirty-three".