113130021 has 4 divisors (see below), whose sum is σ = 150840032. Its totient is φ = 75420012.

The previous prime is 113130013. The next prime is 113130041. The reversal of 113130021 is 120031311.

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 not a de Polignac number, because 113130021 - 2³ = 113130013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 113129979 and 113130006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113130001) 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, 18855001 + ... + 18855006.

It is an arithmetic number, because the mean of its divisors is an integer number (37710008).

Almost surely, 2^113130021 is an apocalyptic number.

It is an amenable number.

113130021 is a deficient number, since it is larger than the sum of its proper divisors (37710011).

113130021 is an equidigital number, since it uses as much as digits as its factorization.

113130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37710010.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 113130021 is about 10636.2597279307. The cubic root of 113130021 is about 483.6441687709.

Adding to 113130021 its reverse (120031311), we get a palindrome (233161332).

The spelling of 113130021 in words is "one hundred thirteen million, one hundred thirty thousand, twenty-one".