12121028 has 12 divisors (see below), whose sum is σ = 21348012. Its totient is φ = 6021600.

The previous prime is 12121009. The next prime is 12121061. The reversal of 12121028 is 82012121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5161984 + 6959044 = 2272^2 + 2638^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12120997 and 12121015.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9023 + ... + 10278.

It is an arithmetic number, because the mean of its divisors is an integer number (1779001).

Almost surely, 2^12121028 is an apocalyptic number.

It is an amenable number.

12121028 is a deficient number, since it is larger than the sum of its proper divisors (9226984).

12121028 is a wasteful number, since it uses less digits than its factorization.

12121028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19462 (or 19460 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 12121028 is about 3481.5266766176. The cubic root of 12121028 is about 229.7099557510.

Adding to 12121028 its reverse (82012121), we get a palindrome (94133149).

The spelling of 12121028 in words is "twelve million, one hundred twenty-one thousand, twenty-eight".