21107630 has 8 divisors (see below), whose sum is σ = 37993752. Its totient is φ = 8443048.

The previous prime is 21107587. The next prime is 21107633. The reversal of 21107630 is 3670112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21107633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1055372 + ... + 1055391.

It is an arithmetic number, because the mean of its divisors is an integer number (4749219).

Almost surely, 2^21107630 is an apocalyptic number.

21107630 is a deficient number, since it is larger than the sum of its proper divisors (16886122).

21107630 is a wasteful number, since it uses less digits than its factorization.

21107630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110770.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 21107630 is about 4594.3040822305. The cubic root of 21107630 is about 276.3629527928.

Adding to 21107630 its reverse (3670112), we get a palindrome (24777742).

The spelling of 21107630 in words is "twenty-one million, one hundred seven thousand, six hundred thirty".