21113113 has 8 divisors (see below), whose sum is σ = 24236480. Its totient is φ = 18016560.

The previous prime is 21113111. The next prime is 21113119. The reversal of 21113113 is 31131112.

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 21113113 - 2¹ = 21113111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113093 and 21113102.

It is not an unprimeable number, because it can be changed into a prime (21113111) 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, 4983 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (3029560).

Almost surely, 2^21113113 is an apocalyptic number.

It is an amenable number.

21113113 is a deficient number, since it is larger than the sum of its proper divisors (3123367).

21113113 is a wasteful number, since it uses less digits than its factorization.

21113113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13407.

The product of its digits is 18, while the sum is 13.

The square root of 21113113 is about 4594.9007606258. The cubic root of 21113113 is about 276.3868804259.

Adding to 21113113 its reverse (31131112), we get a palindrome (52244225).

The spelling of 21113113 in words is "twenty-one million, one hundred thirteen thousand, one hundred thirteen".