21303010 has 16 divisors (see below), whose sum is σ = 38402496. Its totient is φ = 8508528.

The previous prime is 21302993. The next prime is 21303011. The reversal of 21303010 is 1030312.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21303011) 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 7 ways as a sum of consecutive naturals, for example, 8569 + ... + 10771.

It is an arithmetic number, because the mean of its divisors is an integer number (2400156).

Almost surely, 2^21303010 is an apocalyptic number.

21303010 is a deficient number, since it is larger than the sum of its proper divisors (17099486).

21303010 is a wasteful number, since it uses less digits than its factorization.

21303010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3177.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21303010 is about 4615.5183890870. The cubic root of 21303010 is about 277.2130410239.

Adding to 21303010 its reverse (1030312), we get a palindrome (22333322).

It can be divided in two parts, 21 and 303010, that added together give a triangular number (303031 = T₇₇₈).

The spelling of 21303010 in words is "twenty-one million, three hundred three thousand, ten".