105021055 has 4 divisors (see below), whose sum is σ = 126025272. Its totient is φ = 84016840.

The previous prime is 105021047. The next prime is 105021061. The reversal of 105021055 is 550120501.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 105021055 - 2³ = 105021047 is a prime.

It is a super-3 number, since 3×105021055³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 10502101 + ... + 10502110.

It is an arithmetic number, because the mean of its divisors is an integer number (31506318).

Almost surely, 2^105021055 is an apocalyptic number.

105021055 is a deficient number, since it is larger than the sum of its proper divisors (21004217).

105021055 is an equidigital number, since it uses as much as digits as its factorization.

105021055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21004216.

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 105021055 is about 10247.9780932631. The cubic root of 105021055 is about 471.8009295898.

Adding to 105021055 its reverse (550120501), we get a palindrome (655141556).

The spelling of 105021055 in words is "one hundred five million, twenty-one thousand, fifty-five".