21717684224 has 26 divisors (see below), whose sum is σ = 43430074470. Its totient is φ = 10858840064.

The previous prime is 21717684211. The next prime is 21717684257. The reversal of 21717684224 is 42248671712.

It can be written as a sum of positive squares in only one way, i.e., 20643942400 + 1073741824 = 143680^2 + 32768^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2646989 + ... + 2655180.

Almost surely, 2^21717684224 is an apocalyptic number.

It is an amenable number.

21717684224 is a deficient number, since it is larger than the sum of its proper divisors (21712390246).

21717684224 is an frugal number, since it uses more digits than its factorization.

21717684224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5302193 (or 5302171 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The spelling of 21717684224 in words is "twenty-one billion, seven hundred seventeen million, six hundred eighty-four thousand, two hundred twenty-four".