105124421 has 4 divisors (see below), whose sum is σ = 109695072. Its totient is φ = 100553772.

The previous prime is 105124403. The next prime is 105124427. The reversal of 105124421 is 124421501.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124421501 = 59 ⋅2108839.

It is a cyclic number.

It is not a de Polignac number, because 105124421 - 2¹⁰ = 105123397 is a prime.

It is a super-2 number, since 2×105124421² = 22102287781170482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105124393 and 105124402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105124427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2285291 + ... + 2285336.

It is an arithmetic number, because the mean of its divisors is an integer number (27423768).

Almost surely, 2^105124421 is an apocalyptic number.

It is an amenable number.

105124421 is a deficient number, since it is larger than the sum of its proper divisors (4570651).

105124421 is an equidigital number, since it uses as much as digits as its factorization.

105124421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4570650.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 105124421 is about 10253.0200916608. The cubic root of 105124421 is about 471.9556673985.

Adding to 105124421 its reverse (124421501), we get a palindrome (229545922).

The spelling of 105124421 in words is "one hundred five million, one hundred twenty-four thousand, four hundred twenty-one".