105121423 has 4 divisors (see below), whose sum is σ = 114677928. Its totient is φ = 95564920.

The previous prime is 105121411. The next prime is 105121427. The reversal of 105121423 is 324121501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324121501 = 11 ⋅29465591.

It is not a de Polignac number, because 105121423 - 2¹³ = 105113231 is a prime.

It is a super-2 number, since 2×105121423² = 22101027147089858, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105121423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105121427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778236 + ... + 4778257.

It is an arithmetic number, because the mean of its divisors is an integer number (28669482).

Almost surely, 2^105121423 is an apocalyptic number.

105121423 is a deficient number, since it is larger than the sum of its proper divisors (9556505).

105121423 is an equidigital number, since it uses as much as digits as its factorization.

105121423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556504.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 105121423 is about 10252.8738897930. The cubic root of 105121423 is about 471.9511808528.

Adding to 105121423 its reverse (324121501), we get a palindrome (429242924).

It can be divided in two parts, 10512 and 1423, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 105121423 in words is "one hundred five million, one hundred twenty-one thousand, four hundred twenty-three".