105043021 has 4 divisors (see below), whose sum is σ = 105101152. Its totient is φ = 104984892.

The previous prime is 105043019. The next prime is 105043033. The reversal of 105043021 is 120340501.

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 105043021 - 2¹ = 105043019 is a prime.

It is a super-2 number, since 2×105043021² = 22068072521612882, 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 = 105042986 and 105043004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105043321) 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, 26265 + ... + 29998.

It is an arithmetic number, because the mean of its divisors is an integer number (26275288).

Almost surely, 2^105043021 is an apocalyptic number.

It is an amenable number.

105043021 is a deficient number, since it is larger than the sum of its proper divisors (58131).

105043021 is an equidigital number, since it uses as much as digits as its factorization.

105043021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58130.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 105043021 is about 10249.0497608315. The cubic root of 105043021 is about 471.8338209522.

Adding to 105043021 its reverse (120340501), we get a palindrome (225383522).

The spelling of 105043021 in words is "one hundred five million, forty-three thousand, twenty-one".