12121823 has 8 divisors (see below), whose sum is σ = 13960320. Its totient is φ = 10310040.

The previous prime is 12121819. The next prime is 12121831. The reversal of 12121823 is 32812121.

12121823 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 12121823 - 2² = 12121819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121795 and 12121804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121873) 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, 5693 + ... + 7526.

It is an arithmetic number, because the mean of its divisors is an integer number (1745040).

Almost surely, 2^12121823 is an apocalyptic number.

12121823 is a deficient number, since it is larger than the sum of its proper divisors (1838497).

12121823 is a wasteful number, since it uses less digits than its factorization.

12121823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13357.

The product of its digits is 192, while the sum is 20.

The square root of 12121823 is about 3481.6408487953. The cubic root of 12121823 is about 229.7149777514.

Adding to 12121823 its reverse (32812121), we get a palindrome (44933944).

The spelling of 12121823 in words is "twelve million, one hundred twenty-one thousand, eight hundred twenty-three".