121320113123 has 12 divisors (see below), whose sum is σ = 133684461624. Its totient is φ = 110015928000.

The previous prime is 121320113111. The next prime is 121320113137. The reversal of 121320113123 is 321311023121.

It is a happy number.

It is not a de Polignac number, because 121320113123 - 2⁴ = 121320113107 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121320113095 and 121320113104.

It is not an unprimeable number, because it can be changed into a prime (121320113143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1201661 + ... + 1298702.

It is an arithmetic number, because the mean of its divisors is an integer number (11140371802).

Almost surely, 2^121320113123 is an apocalyptic number.

121320113123 is a deficient number, since it is larger than the sum of its proper divisors (12364348501).

121320113123 is a wasteful number, since it uses less digits than its factorization.

121320113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2500786 (or 2500775 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121320113123 its reverse (321311023121), we get a palindrome (442631136244).

The spelling of 121320113123 in words is "one hundred twenty-one billion, three hundred twenty million, one hundred thirteen thousand, one hundred twenty-three".