21010630 has 16 divisors (see below), whose sum is σ = 37963584. Its totient is φ = 8372160.

The previous prime is 21010609. The next prime is 21010663. The reversal of 21010630 is 3601012.

It is a self number, because there is not a number n which added to its sum of digits gives 21010630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167 + ... + 6586.

It is an arithmetic number, because the mean of its divisors is an integer number (2372724).

Almost surely, 2^21010630 is an apocalyptic number.

21010630 is a deficient number, since it is larger than the sum of its proper divisors (16952954).

21010630 is a wasteful number, since it uses less digits than its factorization.

21010630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8031.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21010630 is about 4583.7353763061. The cubic root of 21010630 is about 275.9389611571.

Adding to 21010630 its reverse (3601012), we get a palindrome (24611642).

The spelling of 21010630 in words is "twenty-one million, ten thousand, six hundred thirty".