21117676 has 24 divisors (see below), whose sum is σ = 38372096. Its totient is φ = 10160640.

The previous prime is 21117671. The next prime is 21117697. The reversal of 21117676 is 67671112.

It is not an unprimeable number, because it can be changed into a prime (21117671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13621 + ... + 15091.

Almost surely, 2^21117676 is an apocalyptic number.

It is an amenable number.

21117676 is a deficient number, since it is larger than the sum of its proper divisors (17254420).

21117676 is a wasteful number, since it uses less digits than its factorization.

21117676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609 (or 1607 counting only the distinct ones).

The product of its digits is 3528, while the sum is 31.

The square root of 21117676 is about 4595.3972624791. The cubic root of 21117676 is about 276.4067900510.

Adding to 21117676 its reverse (67671112), we get a palindrome (88788788).

The spelling of 21117676 in words is "twenty-one million, one hundred seventeen thousand, six hundred seventy-six".