23121117 has 6 divisors (see below), whose sum is σ = 33397182. Its totient is φ = 15414072.

The previous prime is 23121103. The next prime is 23121127. The reversal of 23121117 is 71112132.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18481401 + 4639716 = 4299^2 + 2154^2 .

It is not a de Polignac number, because 23121117 - 2⁴ = 23121101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23121117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1284498 + ... + 1284515.

It is an arithmetic number, because the mean of its divisors is an integer number (5566197).

Almost surely, 2^23121117 is an apocalyptic number.

It is an amenable number.

23121117 is a deficient number, since it is larger than the sum of its proper divisors (10276065).

23121117 is a wasteful number, since it uses less digits than its factorization.

23121117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569019 (or 2569016 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 23121117 is about 4808.4422633531. The cubic root of 23121117 is about 284.8850136322.

Adding to 23121117 its reverse (71112132), we get a palindrome (94233249).

The spelling of 23121117 in words is "twenty-three million, one hundred twenty-one thousand, one hundred seventeen".