21416624456 has 16 divisors (see below), whose sum is σ = 41241473340. Its totient is φ = 10418898240.

The previous prime is 21416624407. The next prime is 21416624477. The reversal of 21416624456 is 65442661412.

It can be written as a sum of positive squares in 2 ways, for example, as 20819604100 + 597020356 = 144290^2 + 24434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36176435 + ... + 36177026.

Almost surely, 2^21416624456 is an apocalyptic number.

It is an amenable number.

21416624456 is a deficient number, since it is larger than the sum of its proper divisors (19824848884).

21416624456 is a wasteful number, since it uses less digits than its factorization.

21416624456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72353504 (or 72353500 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The spelling of 21416624456 in words is "twenty-one billion, four hundred sixteen million, six hundred twenty-four thousand, four hundred fifty-six".