21311042330 has 8 divisors (see below), whose sum is σ = 38359876212. Its totient is φ = 8524416928.

The previous prime is 21311042323. The next prime is 21311042339. The reversal of 21311042330 is 3324011312.

It can be written as a sum of positive squares in 2 ways, for example, as 19542082849 + 1768959481 = 139793^2 + 42059^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21311042339) 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 3 ways as a sum of consecutive naturals, for example, 1065552107 + ... + 1065552126.

Almost surely, 2^21311042330 is an apocalyptic number.

21311042330 is a deficient number, since it is larger than the sum of its proper divisors (17048833882).

21311042330 is a wasteful number, since it uses less digits than its factorization.

21311042330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131104240.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21311042330 its reverse (3324011312), we get a palindrome (24635053642).

The spelling of 21311042330 in words is "twenty-one billion, three hundred eleven million, forty-two thousand, three hundred thirty".