21303130 has 16 divisors (see below), whose sum is σ = 38996640. Its totient is φ = 8376592.

The previous prime is 21303127. The next prime is 21303131. The reversal of 21303130 is 3130312.

It is a self number, because there is not a number n which added to its sum of digits gives 21303130.

It is not an unprimeable number, because it can be changed into a prime (21303131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17464 + ... + 18643.

It is an arithmetic number, because the mean of its divisors is an integer number (2437290).

Almost surely, 2^21303130 is an apocalyptic number.

21303130 is a deficient number, since it is larger than the sum of its proper divisors (17693510).

21303130 is a wasteful number, since it uses less digits than its factorization.

21303130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36173.

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

The square root of 21303130 is about 4615.5313886919. The cubic root of 21303130 is about 277.2135615372.

Adding to 21303130 its reverse (3130312), we get a palindrome (24433442).

The spelling of 21303130 in words is "twenty-one million, three hundred three thousand, one hundred thirty".