21321113 has 8 divisors (see below), whose sum is σ = 23379840. Its totient is φ = 19282480.

The previous prime is 21321101. The next prime is 21321121. The reversal of 21321113 is 31112312.

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

It is a cyclic number.

It is not a de Polignac number, because 21321113 - 2¹² = 21317017 is a prime.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (21321133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2753 + ... + 7086.

It is an arithmetic number, because the mean of its divisors is an integer number (2922480).

Almost surely, 2^21321113 is an apocalyptic number.

It is an amenable number.

21321113 is a deficient number, since it is larger than the sum of its proper divisors (2058727).

21321113 is a wasteful number, since it uses less digits than its factorization.

21321113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10047.

The product of its digits is 36, while the sum is 14.

The square root of 21321113 is about 4617.4790741269. The cubic root of 21321113 is about 277.2915427135.

Adding to 21321113 its reverse (31112312), we get a palindrome (52433425).

The spelling of 21321113 in words is "twenty-one million, three hundred twenty-one thousand, one hundred thirteen".