105221520 has 60 divisors (see below), whose sum is σ = 353371356. Its totient is φ = 28058880.

The previous prime is 105221513. The next prime is 105221549. The reversal of 105221520 is 25122501.

It can be written as a sum of positive squares in 2 ways, for example, as 72182016 + 33039504 = 8496^2 + 5748^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×105221520² = 22143136542220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 105221493 and 105221502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72351 + ... + 73790.

Almost surely, 2^105221520 is an apocalyptic number.

105221520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

105221520 is an abundant number, since it is smaller than the sum of its proper divisors (248149836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

105221520 is a wasteful number, since it uses less digits than its factorization.

105221520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146160 (or 146151 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 105221520 is about 10257.7541401615. The cubic root of 105221520 is about 472.1009312069.

The spelling of 105221520 in words is "one hundred five million, two hundred twenty-one thousand, five hundred twenty".