123121113 has 4 divisors (see below), whose sum is σ = 164161488. Its totient is φ = 82080740.

The previous prime is 123121111. The next prime is 123121129. The reversal of 123121113 is 311121321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123121113 - 2¹ = 123121111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123121092 and 123121101.

It is not an unprimeable number, because it can be changed into a prime (123121111) 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 3 ways as a sum of consecutive naturals, for example, 20520183 + ... + 20520188.

It is an arithmetic number, because the mean of its divisors is an integer number (41040372).

Almost surely, 2^123121113 is an apocalyptic number.

It is an amenable number.

123121113 is a deficient number, since it is larger than the sum of its proper divisors (41040375).

123121113 is an equidigital number, since it uses as much as digits as its factorization.

123121113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41040374.

The product of its digits is 36, while the sum is 15.

The square root of 123121113 is about 11095.9953586868. The cubic root of 123121113 is about 497.4821595751.

Adding to 123121113 its reverse (311121321), we get a palindrome (434242434).

The spelling of 123121113 in words is "one hundred twenty-three million, one hundred twenty-one thousand, one hundred thirteen".