21303674 has 24 divisors (see below), whose sum is σ = 38579040. Its totient is φ = 8619048.

The previous prime is 21303673. The next prime is 21303679. The reversal of 21303674 is 47630312.

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 75137 + ... + 75419.

It is an arithmetic number, because the mean of its divisors is an integer number (1607460).

Almost surely, 2^21303674 is an apocalyptic number.

21303674 is a deficient number, since it is larger than the sum of its proper divisors (17275366).

21303674 is an equidigital number, since it uses as much as digits as its factorization.

21303674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 21303674 is about 4615.5903197749. The cubic root of 21303674 is about 277.2159211732.

Adding to 21303674 its reverse (47630312), we get a palindrome (68933986).

The spelling of 21303674 in words is "twenty-one million, three hundred three thousand, six hundred seventy-four".