105252221 has 4 divisors (see below), whose sum is σ = 105303744. Its totient is φ = 105200700.

The previous prime is 105252211. The next prime is 105252239. The reversal of 105252221 is 122252501.

It is a happy number.

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 105252221 - 2⁶ = 105252157 is a prime.

It is a super-2 number, since 2×105252221² = 22156060050865682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 105252193 and 105252202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105252211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22565 + ... + 26826.

It is an arithmetic number, because the mean of its divisors is an integer number (26325936).

Almost surely, 2^105252221 is an apocalyptic number.

It is an amenable number.

105252221 is a deficient number, since it is larger than the sum of its proper divisors (51523).

105252221 is an equidigital number, since it uses as much as digits as its factorization.

105252221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51522.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 105252221 is about 10259.2505086873. The cubic root of 105252221 is about 472.1468424783.

The spelling of 105252221 in words is "one hundred five million, two hundred fifty-two thousand, two hundred twenty-one".