21331113 has 8 divisors (see below), whose sum is σ = 28493088. Its totient is φ = 14194944.

The previous prime is 21331109. The next prime is 21331127. The reversal of 21331113 is 31113312.

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

It is not a de Polignac number, because 21331113 - 2² = 21331109 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21331092 and 21331101.

It is not an unprimeable number, because it can be changed into a prime (21331103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4431 + ... + 7892.

It is an arithmetic number, because the mean of its divisors is an integer number (3561636).

Almost surely, 2^21331113 is an apocalyptic number.

It is an amenable number.

21331113 is a deficient number, since it is larger than the sum of its proper divisors (7161975).

21331113 is a wasteful number, since it uses less digits than its factorization.

21331113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12903.

The product of its digits is 54, while the sum is 15.

The square root of 21331113 is about 4618.5617891287. The cubic root of 21331113 is about 277.3348875742.

Adding to 21331113 its reverse (31113312), we get a palindrome (52444425).

The spelling of 21331113 in words is "twenty-one million, three hundred thirty-one thousand, one hundred thirteen".