113131021 has 8 divisors (see below), whose sum is σ = 115726464. Its totient is φ = 110543520.

The previous prime is 113130961. The next prime is 113131037. The reversal of 113131021 is 120131311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-113131021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113130992 and 113131010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113131321) 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, 34186 + ... + 37348.

It is an arithmetic number, because the mean of its divisors is an integer number (14465808).

Almost surely, 2^113131021 is an apocalyptic number.

It is an amenable number.

113131021 is a deficient number, since it is larger than the sum of its proper divisors (2595443).

113131021 is an equidigital number, since it uses as much as digits as its factorization.

113131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971.

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

The square root of 113131021 is about 10636.3067368330. The cubic root of 113131021 is about 483.6455938060.

Adding to 113131021 its reverse (120131311), we get a palindrome (233262332).

The spelling of 113131021 in words is "one hundred thirteen million, one hundred thirty-one thousand, twenty-one".