21331213113 has 48 divisors (see below), whose sum is σ = 34347058560. Its totient is φ = 11533750272.

The previous prime is 21331213103. The next prime is 21331213157. The reversal of 21331213113 is 31131213312.

It is a happy number.

It is not a de Polignac number, because 21331213113 - 2¹⁴ = 21331196729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21331213113.

It is not an unprimeable number, because it can be changed into a prime (21331213103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10680631 + ... + 10682627.

It is an arithmetic number, because the mean of its divisors is an integer number (715563720).

Almost surely, 2^21331213113 is an apocalyptic number.

It is an amenable number.

21331213113 is a deficient number, since it is larger than the sum of its proper divisors (13015845447).

21331213113 is a wasteful number, since it uses less digits than its factorization.

21331213113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3454 (or 3435 counting only the distinct ones).

The product of its digits is 324, while the sum is 21.

Adding to 21331213113 its reverse (31131213312), we get a palindrome (52462426425).

The spelling of 21331213113 in words is "twenty-one billion, three hundred thirty-one million, two hundred thirteen thousand, one hundred thirteen".