21305030330 has 16 divisors (see below), whose sum is σ = 38365149960. Its totient is φ = 8518435392.

The previous prime is 21305030323. The next prime is 21305030339. The reversal of 21305030330 is 3303050312.

It can be written as a sum of positive squares in 4 ways, for example, as 6751744561 + 14553285769 = 82169^2 + 120637^2 .

It is not an unprimeable number, because it can be changed into a prime (21305030339) 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, 422009 + ... + 469788.

Almost surely, 2^21305030330 is an apocalyptic number.

21305030330 is a deficient number, since it is larger than the sum of its proper divisors (17060119630).

21305030330 is a wasteful number, since it uses less digits than its factorization.

21305030330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894193.

The product of its (nonzero) digits is 810, while the sum is 20.

Adding to 21305030330 its reverse (3303050312), we get a palindrome (24608080642).

The spelling of 21305030330 in words is "twenty-one billion, three hundred five million, thirty thousand, three hundred thirty".