21013312330 has 16 divisors (see below), whose sum is σ = 38444028264. Its totient is φ = 8267532480.

The previous prime is 21013312303. The next prime is 21013312339. The reversal of 21013312330 is 3321331012.

It can be written as a sum of positive squares in 4 ways, for example, as 8437708449 + 12575603881 = 91857^2 + 112141^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21013312298 and 21013312307.

It is not an unprimeable number, because it can be changed into a prime (21013312339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17223417 + ... + 17224636.

Almost surely, 2^21013312330 is an apocalyptic number.

21013312330 is a deficient number, since it is larger than the sum of its proper divisors (17430715934).

21013312330 is a wasteful number, since it uses less digits than its factorization.

21013312330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34448121.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21013312330 its reverse (3321331012), we get a palindrome (24334643342).

The spelling of 21013312330 in words is "twenty-one billion, thirteen million, three hundred twelve thousand, three hundred thirty".