105521213 has 8 divisors (see below), whose sum is σ = 120672000. Its totient is φ = 90389520.

The previous prime is 105521209. The next prime is 105521233. The reversal of 105521213 is 312125501.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 105521213 - 2² = 105521209 is a prime.

It is a super-2 number, since 2×105521213² = 22269452785982738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105521203) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10223 + ... + 17763.

It is an arithmetic number, because the mean of its divisors is an integer number (15084000).

Almost surely, 2^105521213 is an apocalyptic number.

It is an amenable number.

105521213 is a deficient number, since it is larger than the sum of its proper divisors (15150787).

105521213 is an equidigital number, since it uses as much as digits as its factorization.

105521213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9547.

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

The square root of 105521213 is about 10272.3518728673. The cubic root of 105521213 is about 472.5487205624.

Adding to 105521213 its reverse (312125501), we get a palindrome (417646714).

The spelling of 105521213 in words is "one hundred five million, five hundred twenty-one thousand, two hundred thirteen".