113123121021 has 28 divisors (see below), whose sum is σ = 169908966048. Its totient is φ = 75281188104.

The previous prime is 113123120989. The next prime is 113123121079. The reversal of 113123121021 is 120121321311.

113123121021 is a `hidden beast` number, since 11 + 312 + 312 + 10 + 21 = 666.

It is not a de Polignac number, because 113123121021 - 2⁵ = 113123120989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 113123120985 and 113123121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113123121121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 272616 + ... + 548238.

Almost surely, 2^113123121021 is an apocalyptic number.

It is an amenable number.

113123121021 is a deficient number, since it is larger than the sum of its proper divisors (56785845027).

113123121021 is an frugal number, since it uses more digits than its factorization.

113123121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276204 (or 276189 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 113123121021 its reverse (120121321311), we get a palindrome (233244442332).

The spelling of 113123121021 in words is "one hundred thirteen billion, one hundred twenty-three million, one hundred twenty-one thousand, twenty-one".