21230312330 has 16 divisors (see below), whose sum is σ = 38218107744. Its totient is φ = 8491337040.

The previous prime is 21230312309. The next prime is 21230312333. The reversal of 21230312330 is 3321303212.

It is not an unprimeable number, because it can be changed into a prime (21230312333) 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, 21665 + ... + 207195.

It is an arithmetic number, because the mean of its divisors is an integer number (2388631734).

Almost surely, 2^21230312330 is an apocalyptic number.

21230312330 is a deficient number, since it is larger than the sum of its proper divisors (16987795414).

21230312330 is a wasteful number, since it uses less digits than its factorization.

21230312330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196981.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21230312330 its reverse (3321303212), we get a palindrome (24551615542).

The spelling of 21230312330 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, three hundred thirty".