113123021 has 8 divisors (see below), whose sum is σ = 124428288. Its totient is φ = 102837900.

The previous prime is 113122991. The next prime is 113123033. The reversal of 113123021 is 120321311.

It is not a de Polignac number, because 113123021 - 2⁶ = 113122957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113122987 and 113123005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113123071) 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 7 ways as a sum of consecutive naturals, for example, 41165 + ... + 43826.

It is an arithmetic number, because the mean of its divisors is an integer number (15553536).

Almost surely, 2^113123021 is an apocalyptic number.

113123021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

113123021 is a deficient number, since it is larger than the sum of its proper divisors (11305267).

113123021 is an frugal number, since it uses more digits than its factorization.

113123021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85024 (or 85002 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 113123021 is about 10635.9306597965. The cubic root of 113123021 is about 483.6341932903.

Adding to 113123021 its reverse (120321311), we get a palindrome (233444332).

The spelling of 113123021 in words is "one hundred thirteen million, one hundred twenty-three thousand, twenty-one".