113212121 has 8 divisors (see below), whose sum is σ = 123621984. Its totient is φ = 102821920.

The previous prime is 113212109. The next prime is 113212133. The reversal of 113212121 is 121212311.

It is an interprime number because it is at equal distance from previous prime (113212109) and next prime (113212133).

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

It is a cyclic number.

It is not a de Polignac number, because 113212121 - 2¹⁰ = 113211097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 113212096 and 113212105.

It is not an unprimeable number, because it can be changed into a prime (113212181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8810 + ... + 17436.

It is an arithmetic number, because the mean of its divisors is an integer number (15452748).

Almost surely, 2^113212121 is an apocalyptic number.

113212121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

113212121 is a deficient number, since it is larger than the sum of its proper divisors (10409863).

113212121 is a wasteful number, since it uses less digits than its factorization.

113212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9831.

The product of its digits is 24, while the sum is 14.

The square root of 113212121 is about 10640.1184673856. The cubic root of 113212121 is about 483.7611362049.

Adding to 113212121 its reverse (121212311), we get a palindrome (234424432).

The spelling of 113212121 in words is "one hundred thirteen million, two hundred twelve thousand, one hundred twenty-one".