10118221 has 4 divisors (see below), whose sum is σ = 10124892. Its totient is φ = 10111552.

The previous prime is 10118219. The next prime is 10118231. The reversal of 10118221 is 12281101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1297321 + 8820900 = 1139^2 + 2970^2 .

It is a cyclic number.

It is not a de Polignac number, because 10118221 - 2¹ = 10118219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10118195 and 10118204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10118231) 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 3 ways as a sum of consecutive naturals, for example, 165 + ... + 4501.

It is an arithmetic number, because the mean of its divisors is an integer number (2531223).

Almost surely, 2^10118221 is an apocalyptic number.

It is an amenable number.

10118221 is a deficient number, since it is larger than the sum of its proper divisors (6671).

10118221 is an equidigital number, since it uses as much as digits as its factorization.

10118221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 10118221 is about 3180.9151198987. The cubic root of 10118221 is about 216.2891432367.

Adding to 10118221 its reverse (12281101), we get a palindrome (22399322).

It can be divided in two parts, 101 and 18221, that multiplied together give a triangular number (1840321 = T₁₉₁₈).

The spelling of 10118221 in words is "ten million, one hundred eighteen thousand, two hundred twenty-one".