121131423 has 16 divisors (see below), whose sum is σ = 205090560. Its totient is φ = 69217848.

The previous prime is 121131407. The next prime is 121131431. The reversal of 121131423 is 324131121.

121131423 is a `hidden beast` number, since 1 + 211 + 31 + 423 = 666.

It is not a de Polignac number, because 121131423 - 2⁴ = 121131407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121131396 and 121131405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121131433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320265 + ... + 320642.

It is an arithmetic number, because the mean of its divisors is an integer number (12818160).

Almost surely, 2^121131423 is an apocalyptic number.

121131423 is a deficient number, since it is larger than the sum of its proper divisors (83959137).

121131423 is an equidigital number, since it uses as much as digits as its factorization.

121131423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640923 (or 640917 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 121131423 is about 11005.9721515185. The cubic root of 121131423 is about 494.7877510606.

Adding to 121131423 its reverse (324131121), we get a palindrome (445262544).

The spelling of 121131423 in words is "one hundred twenty-one million, one hundred thirty-one thousand, four hundred twenty-three".