23121518 has 16 divisors (see below), whose sum is σ = 41723520. Its totient is φ = 9387576.

The previous prime is 23121517. The next prime is 23121521. The reversal of 23121518 is 81512132.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 23121493 and 23121502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121517) 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 7 ways as a sum of consecutive naturals, for example, 43196 + ... + 43727.

It is an arithmetic number, because the mean of its divisors is an integer number (2607720).

Almost surely, 2^23121518 is an apocalyptic number.

23121518 is a deficient number, since it is larger than the sum of its proper divisors (18602002).

23121518 is a wasteful number, since it uses less digits than its factorization.

23121518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86951.

The product of its digits is 480, while the sum is 23.

The square root of 23121518 is about 4808.4839606679. The cubic root of 23121518 is about 284.8866605859.

The spelling of 23121518 in words is "twenty-three million, one hundred twenty-one thousand, five hundred eighteen".