105021506 has 4 divisors (see below), whose sum is σ = 157532262. Its totient is φ = 52510752.

The previous prime is 105021491. The next prime is 105021509. The reversal of 105021506 is 605120501.

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

It can be written as a sum of positive squares in only one way, i.e., 87590881 + 17430625 = 9359^2 + 4175^2 .

It is a super-2 number, since 2×105021506² = 22059033445016072, which contains 22 as substring.

It is a Curzon 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 as a sum of consecutive naturals, namely, 26255375 + ... + 26255378.

Almost surely, 2^105021506 is an apocalyptic number.

105021506 is a deficient number, since it is larger than the sum of its proper divisors (52510756).

105021506 is an equidigital number, since it uses as much as digits as its factorization.

105021506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52510755.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 105021506 is about 10248.0000975800. Note that the first 4 decimals coincide. The cubic root of 105021506 is about 471.8016049525.

The spelling of 105021506 in words is "one hundred five million, twenty-one thousand, five hundred six".