21331443113 has 4 divisors (see below), whose sum is σ = 21499407360. Its totient is φ = 21163478868.

The previous prime is 21331443109. The next prime is 21331443121. The reversal of 21331443113 is 31134413312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21331443113 - 2² = 21331443109 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331443143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83981933 + ... + 83982186.

It is an arithmetic number, because the mean of its divisors is an integer number (5374851840).

Almost surely, 2^21331443113 is an apocalyptic number.

It is an amenable number.

21331443113 is a deficient number, since it is larger than the sum of its proper divisors (167964247).

21331443113 is a wasteful number, since it uses less digits than its factorization.

21331443113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167964246.

The product of its digits is 2592, while the sum is 26.

Adding to 21331443113 its reverse (31134413312), we get a palindrome (52465856425).

The spelling of 21331443113 in words is "twenty-one billion, three hundred thirty-one million, four hundred forty-three thousand, one hundred thirteen".