21331322116 has 48 divisors (see below), whose sum is σ = 42897030400. Its totient is φ = 9199256832.

The previous prime is 21331322113. The next prime is 21331322143. The reversal of 21331322116 is 61122313312.

It is a happy number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 75756 + ... + 220003.

Almost surely, 2^21331322116 is an apocalyptic number.

21331322116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21331322116 is an abundant number, since it is smaller than the sum of its proper divisors (21565708284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21331322116 is a wasteful number, since it uses less digits than its factorization.

21331322116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295868 (or 295866 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

Adding to 21331322116 its reverse (61122313312), we get a palindrome (82453635428).

The spelling of 21331322116 in words is "twenty-one billion, three hundred thirty-one million, three hundred twenty-two thousand, one hundred sixteen".