21130630 has 32 divisors (see below), whose sum is σ = 39292704. Its totient is φ = 8176896.

The previous prime is 21130619. The next prime is 21130649. The reversal of 21130630 is 3603112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67354 + ... + 67666.

It is an arithmetic number, because the mean of its divisors is an integer number (1227897).

Almost surely, 2^21130630 is an apocalyptic number.

21130630 is a deficient number, since it is larger than the sum of its proper divisors (18162074).

21130630 is a wasteful number, since it uses less digits than its factorization.

21130630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 21130630 is about 4596.8065001694. The cubic root of 21130630 is about 276.4632962953.

Adding to 21130630 its reverse (3603112), we get a palindrome (24733742).

The spelling of 21130630 in words is "twenty-one million, one hundred thirty thousand, six hundred thirty".