1223120121 has 16 divisors (see below), whose sum is σ = 1652641536. Its totient is φ = 804532176.

The previous prime is 1223120113. The next prime is 1223120123. The reversal of 1223120121 is 1210213221.

It is not a de Polignac number, because 1223120121 - 2³ = 1223120113 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223120121.

It is not an unprimeable number, because it can be changed into a prime (1223120123) 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 15 ways as a sum of consecutive naturals, for example, 217086 + ... + 222648.

It is an arithmetic number, because the mean of its divisors is an integer number (103290096).

Almost surely, 2^1223120121 is an apocalyptic number.

It is an amenable number.

1223120121 is a deficient number, since it is larger than the sum of its proper divisors (429521415).

1223120121 is an equidigital number, since it uses as much as digits as its factorization.

1223120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6532.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1223120121 is about 34973.1342747544. The cubic root of 1223120121 is about 1069.4398678326.

Adding to 1223120121 its reverse (1210213221), we get a palindrome (2433333342).

The spelling of 1223120121 in words is "one billion, two hundred twenty-three million, one hundred twenty thousand, one hundred twenty-one".