21310330 has 16 divisors (see below), whose sum is σ = 39596544. Its totient is φ = 8249040.

The previous prime is 21310321. The next prime is 21310337. The reversal of 21310330 is 3301312.

It is a self number, because there is not a number n which added to its sum of digits gives 21310330.

It is not an unprimeable number, because it can be changed into a prime (21310337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34062 + ... + 34681.

It is an arithmetic number, because the mean of its divisors is an integer number (2474784).

Almost surely, 2^21310330 is an apocalyptic number.

21310330 is a deficient number, since it is larger than the sum of its proper divisors (18286214).

21310330 is a wasteful number, since it uses less digits than its factorization.

21310330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68781.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21310330 is about 4616.3112979954. The cubic root of 21310330 is about 277.2447887610.

Adding to 21310330 its reverse (3301312), we get a palindrome (24611642).

The spelling of 21310330 in words is "twenty-one million, three hundred ten thousand, three hundred thirty".