21516496 has 10 divisors (see below), whose sum is σ = 41688242. Its totient is φ = 10758240.

The previous prime is 21516487. The next prime is 21516527. The reversal of 21516496 is 69461512.

It can be written as a sum of positive squares in only one way, i.e., 17106496 + 4410000 = 4136^2 + 2100^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672375 + ... + 672406.

Almost surely, 2^21516496 is an apocalyptic number.

It is an amenable number.

21516496 is a deficient number, since it is larger than the sum of its proper divisors (20171746).

21516496 is a wasteful number, since it uses less digits than its factorization.

21516496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344789 (or 1344783 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 21516496 is about 4638.5877161050. The cubic root of 21516496 is about 278.1359857799.

The spelling of 21516496 in words is "twenty-one million, five hundred sixteen thousand, four hundred ninety-six".