105021505 has 4 divisors (see below), whose sum is σ = 126025812. Its totient is φ = 84017200.

The previous prime is 105021491. The next prime is 105021509. The reversal of 105021505 is 505120501.

It is a Cunningham number, because it is equal to 10248²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505120501 = 181 ⋅2790721.

It can be written as a sum of positive squares in 2 ways, for example, as 37797904 + 67223601 = 6148^2 + 8199^2 .

It is not a de Polignac number, because 105021505 - 2¹¹ = 105019457 is a prime.

It is a super-2 number, since 2×105021505² = 22059033024930050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105021509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10502146 + ... + 10502155.

It is an arithmetic number, because the mean of its divisors is an integer number (31506453).

Almost surely, 2^105021505 is an apocalyptic number.

It is an amenable number.

105021505 is a deficient number, since it is larger than the sum of its proper divisors (21004307).

105021505 is an equidigital number, since it uses as much as digits as its factorization.

105021505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21004306.

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

The square root of 105021505 is about 10248.0000487900. Note that the first 4 decimals coincide. The cubic root of 105021505 is about 471.8016034550.

The spelling of 105021505 in words is "one hundred five million, twenty-one thousand, five hundred five".