21116630 has 32 divisors (see below), whose sum is σ = 39191040. Its totient is φ = 8188000.

The previous prime is 21116629. The next prime is 21116633. The reversal of 21116630 is 3661112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84005 + ... + 84255.

It is an arithmetic number, because the mean of its divisors is an integer number (1224720).

Almost surely, 2^21116630 is an apocalyptic number.

21116630 is a deficient number, since it is larger than the sum of its proper divisors (18074410).

21116630 is a wasteful number, since it uses less digits than its factorization.

21116630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 21116630 is about 4595.2834515403. The cubic root of 21116630 is about 276.4022263185.

Adding to 21116630 its reverse (3661112), we get a palindrome (24777742).

The spelling of 21116630 in words is "twenty-one million, one hundred sixteen thousand, six hundred thirty".