105056221 has 4 divisors (see below), whose sum is σ = 105113052. Its totient is φ = 104999392.

The previous prime is 105056207. The next prime is 105056239. The reversal of 105056221 is 122650501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122650501 = 233 ⋅526397.

It can be written as a sum of positive squares in 2 ways, for example, as 66243321 + 38812900 = 8139^2 + 6230^2 .

It is a cyclic number.

It is not a de Polignac number, because 105056221 - 2⁷ = 105056093 is a prime.

It is a super-2 number, since 2×105056221² = 22073619141601682, 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 = 105056192 and 105056201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105056621) 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, 25546 + ... + 29371.

It is an arithmetic number, because the mean of its divisors is an integer number (26278263).

Almost surely, 2^105056221 is an apocalyptic number.

It is an amenable number.

105056221 is a deficient number, since it is larger than the sum of its proper divisors (56831).

105056221 is an equidigital number, since it uses as much as digits as its factorization.

105056221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56830.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 105056221 is about 10249.6937027406. The cubic root of 105056221 is about 471.8535841106.

The spelling of 105056221 in words is "one hundred five million, fifty-six thousand, two hundred twenty-one".