10518221 has 8 divisors (see below), whose sum is σ = 12248064. Its totient is φ = 8845200.

The previous prime is 10518217. The next prime is 10518247. The reversal of 10518221 is 12281501.

It is a happy number.

10518221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 10518221 - 2² = 10518217 is a prime.

It is a super-2 number, since 2×10518221² = 221265946009682, 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 = 10518193 and 10518202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10518281) 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 7 ways as a sum of consecutive naturals, for example, 13805 + ... + 14546.

It is an arithmetic number, because the mean of its divisors is an integer number (1531008).

Almost surely, 2^10518221 is an apocalyptic number.

It is an amenable number.

10518221 is a deficient number, since it is larger than the sum of its proper divisors (1729843).

10518221 is an equidigital number, since it uses as much as digits as its factorization.

10518221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28411.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 10518221 is about 3243.1806918518. The cubic root of 10518221 is about 219.1025492218.

Adding to 10518221 its reverse (12281501), we get a palindrome (22799722).

The spelling of 10518221 in words is "ten million, five hundred eighteen thousand, two hundred twenty-one".