113123123221 has 4 divisors (see below), whose sum is σ = 113123814112. Its totient is φ = 113122432332.

The previous prime is 113123123209. The next prime is 113123123297. The reversal of 113123123221 is 122321321311.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 113123123221 - 2¹¹ = 113123121173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113123123192 and 113123123201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113123123621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54526 + ... + 478768.

It is an arithmetic number, because the mean of its divisors is an integer number (28280953528).

Almost surely, 2^113123123221 is an apocalyptic number.

It is an amenable number.

113123123221 is a deficient number, since it is larger than the sum of its proper divisors (690891).

113123123221 is an equidigital number, since it uses as much as digits as its factorization.

113123123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690890.

The product of its digits is 432, while the sum is 22.

Adding to 113123123221 its reverse (122321321311), we get a palindrome (235444444532).

The spelling of 113123123221 in words is "one hundred thirteen billion, one hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty-one".