21331322115 has 16 divisors (see below), whose sum is σ = 35231087616. Its totient is φ = 11009714400.

The previous prime is 21331322113. The next prime is 21331322143. The reversal of 21331322115 is 51122313312.

It is a happy number.

It is not a de Polignac number, because 21331322115 - 2¹ = 21331322113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21331322113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22936441 + ... + 22937370.

It is an arithmetic number, because the mean of its divisors is an integer number (2201942976).

Almost surely, 2^21331322115 is an apocalyptic number.

21331322115 is a deficient number, since it is larger than the sum of its proper divisors (13899765501).

21331322115 is a wasteful number, since it uses less digits than its factorization.

21331322115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45873850.

The product of its digits is 1080, while the sum is 24.

Adding to 21331322115 its reverse (51122313312), we get a palindrome (72453635427).

The spelling of 21331322115 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, one hundred fifteen".