113131320221 has 4 divisors (see below), whose sum is σ = 113139769344. Its totient is φ = 113122871100.

The previous prime is 113131320187. The next prime is 113131320307. The reversal of 113131320221 is 122023131311.

It is a happy number.

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 113131320221 - 2⁶ = 113131320157 is a prime.

It is a super-2 number, since 2×113131320221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113131320193 and 113131320202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113131320121) 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, 4204445 + ... + 4231266.

It is an arithmetic number, because the mean of its divisors is an integer number (28284942336).

Almost surely, 2^113131320221 is an apocalyptic number.

It is an amenable number.

113131320221 is a deficient number, since it is larger than the sum of its proper divisors (8449123).

113131320221 is an equidigital number, since it uses as much as digits as its factorization.

113131320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8449122.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 113131320221 its reverse (122023131311), we get a palindrome (235154451532).

The spelling of 113131320221 in words is "one hundred thirteen billion, one hundred thirty-one million, three hundred twenty thousand, two hundred twenty-one".