105105521 has 4 divisors (see below), whose sum is σ = 105479844. Its totient is φ = 104731200.

The previous prime is 105105499. The next prime is 105105551. The reversal of 105105521 is 125501501.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33466225 + 71639296 = 5785^2 + 8464^2 .

It is a cyclic number.

It is not a de Polignac number, because 105105521 - 2²⁶ = 37996657 is a prime.

It is a super-2 number, since 2×105105521² = 22094341089362882, 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 = 105105493 and 105105502.

It is not an unprimeable number, because it can be changed into a prime (105105551) 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, 186740 + ... + 187301.

It is an arithmetic number, because the mean of its divisors is an integer number (26369961).

Almost surely, 2^105105521 is an apocalyptic number.

It is an amenable number.

105105521 is a deficient number, since it is larger than the sum of its proper divisors (374323).

105105521 is an equidigital number, since it uses as much as digits as its factorization.

105105521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374322.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 105105521 is about 10252.0983705776. The cubic root of 105105521 is about 471.9273818785.

The spelling of 105105521 in words is "one hundred five million, one hundred five thousand, five hundred twenty-one".