105242221 has 4 divisors (see below), whose sum is σ = 120276832. Its totient is φ = 90207612.

The previous prime is 105242219. The next prime is 105242237. The reversal of 105242221 is 122242501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 105242221 - 2¹ = 105242219 is a prime.

It is a super-2 number, since 2×105242221² = 22151850162025682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105242251) 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, 7517295 + ... + 7517308.

It is an arithmetic number, because the mean of its divisors is an integer number (30069208).

Almost surely, 2^105242221 is an apocalyptic number.

It is an amenable number.

105242221 is a deficient number, since it is larger than the sum of its proper divisors (15034611).

105242221 is an equidigital number, since it uses as much as digits as its factorization.

105242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15034610.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 105242221 is about 10258.7631320740. The cubic root of 105242221 is about 472.1318891344.

Adding to 105242221 its reverse (122242501), we get a palindrome (227484722).

The spelling of 105242221 in words is "one hundred five million, two hundred forty-two thousand, two hundred twenty-one".