21260113 has 4 divisors (see below), whose sum is σ = 24297280. Its totient is φ = 18222948.

The previous prime is 21260101. The next prime is 21260117. The reversal of 21260113 is 31106212.

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 21260113 - 2¹⁷ = 21129041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21260117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1518573 + ... + 1518586.

It is an arithmetic number, because the mean of its divisors is an integer number (6074320).

Almost surely, 2^21260113 is an apocalyptic number.

It is an amenable number.

21260113 is a deficient number, since it is larger than the sum of its proper divisors (3037167).

21260113 is an equidigital number, since it uses as much as digits as its factorization.

21260113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037166.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 21260113 is about 4610.8690070311. The cubic root of 21260113 is about 277.0268451351.

Adding to 21260113 its reverse (31106212), we get a palindrome (52366325).

The spelling of 21260113 in words is "twenty-one million, two hundred sixty thousand, one hundred thirteen".