1223724121 has 16 divisors (see below), whose sum is σ = 1262850048. Its totient is φ = 1185408000.

The previous prime is 1223724109. The next prime is 1223724137. The reversal of 1223724121 is 1214273221.

It is a cyclic number.

It is not a de Polignac number, because 1223724121 - 2⁹ = 1223723609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223724191) 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 15 ways as a sum of consecutive naturals, for example, 1018321 + ... + 1019521.

It is an arithmetic number, because the mean of its divisors is an integer number (78928128).

Almost surely, 2^1223724121 is an apocalyptic number.

It is an amenable number.

1223724121 is a deficient number, since it is larger than the sum of its proper divisors (39125927).

1223724121 is a wasteful number, since it uses less digits than its factorization.

1223724121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512.

The product of its digits is 1344, while the sum is 25.

The square root of 1223724121 is about 34981.7684087011. The cubic root of 1223724121 is about 1069.6158754522.

Adding to 1223724121 its reverse (1214273221), we get a palindrome (2437997342).

The spelling of 1223724121 in words is "one billion, two hundred twenty-three million, seven hundred twenty-four thousand, one hundred twenty-one".