123121221224 has 32 divisors (see below), whose sum is σ = 231476188320. Its totient is φ = 61394389056.

The previous prime is 123121221217. The next prime is 123121221227. The reversal of 123121221224 is 422122121321.

It is a self number, because there is not a number n which added to its sum of digits gives 123121221224.

It is not an unprimeable number, because it can be changed into a prime (123121221227) 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, 7474982 + ... + 7491434.

It is an arithmetic number, because the mean of its divisors is an integer number (7233630885).

Almost surely, 2^123121221224 is an apocalyptic number.

It is an amenable number.

123121221224 is a deficient number, since it is larger than the sum of its proper divisors (108354967096).

123121221224 is a wasteful number, since it uses less digits than its factorization.

123121221224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18929 (or 18925 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 123121221224 its reverse (422122121321), we get a palindrome (545243342545).

The spelling of 123121221224 in words is "one hundred twenty-three billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred twenty-four".