21303670 has 8 divisors (see below), whose sum is σ = 38346624. Its totient is φ = 8521464.

The previous prime is 21303649. The next prime is 21303671. The reversal of 21303670 is 7630312.

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 (21303671) 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, 1065174 + ... + 1065193.

It is an arithmetic number, because the mean of its divisors is an integer number (4793328).

Almost surely, 2^21303670 is an apocalyptic number.

21303670 is a deficient number, since it is larger than the sum of its proper divisors (17042954).

21303670 is a wasteful number, since it uses less digits than its factorization.

21303670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130374.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 21303670 is about 4615.5898864609. The cubic root of 21303670 is about 277.2159038231.

Adding to 21303670 its reverse (7630312), we get a palindrome (28933982).

The spelling of 21303670 in words is "twenty-one million, three hundred three thousand, six hundred seventy".