10221518 has 4 divisors (see below), whose sum is σ = 15332280. Its totient is φ = 5110758.

The previous prime is 10221517. The next prime is 10221521. The reversal of 10221518 is 81512201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555378 + ... + 2555381.

It is an arithmetic number, because the mean of its divisors is an integer number (3833070).

Almost surely, 2^10221518 is an apocalyptic number.

10221518 is a deficient number, since it is larger than the sum of its proper divisors (5110762).

10221518 is an equidigital number, since it uses as much as digits as its factorization.

10221518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5110761.

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

The square root of 10221518 is about 3197.1108832820. The cubic root of 10221518 is about 217.0226851634.

Adding to 10221518 its reverse (81512201), we get a palindrome (91733719).

The spelling of 10221518 in words is "ten million, two hundred twenty-one thousand, five hundred eighteen".