1121320123 has 16 divisors (see below), whose sum is σ = 1414861056. Its totient is φ = 863223840.

The previous prime is 1121320091. The next prime is 1121320129. The reversal of 1121320123 is 3210231211.

It is a cyclic number.

It is not a de Polignac number, because 1121320123 - 2⁵ = 1121320091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1121320097 and 1121320106.

It is not an unprimeable number, because it can be changed into a prime (1121320129) 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 15 ways as a sum of consecutive naturals, for example, 81336 + ... + 94117.

It is an arithmetic number, because the mean of its divisors is an integer number (88428816).

Almost surely, 2^1121320123 is an apocalyptic number.

1121320123 is a deficient number, since it is larger than the sum of its proper divisors (293540933).

1121320123 is a wasteful number, since it uses less digits than its factorization.

1121320123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175554.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1121320123 is about 33486.1183626887. The cubic root of 1121320123 is about 1038.9066798626.

Adding to 1121320123 its reverse (3210231211), we get a palindrome (4331551334).

The spelling of 1121320123 in words is "one billion, one hundred twenty-one million, three hundred twenty thousand, one hundred twenty-three".