10521218 has 8 divisors (see below), whose sum is σ = 15799548. Its totient is φ = 5254704.

The previous prime is 10521169. The next prime is 10521221. The reversal of 10521218 is 81212501.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8427409 + 2093809 = 2903^2 + 1447^2 .

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

It is a super-3 number, since 3×10521218³ (a number of 22 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 10521218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221 + ... + 4592.

Almost surely, 2^10521218 is an apocalyptic number.

10521218 is a deficient number, since it is larger than the sum of its proper divisors (5278330).

10521218 is a wasteful number, since it uses less digits than its factorization.

10521218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5908.

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

The square root of 10521218 is about 3243.6427053546. The cubic root of 10521218 is about 219.1233571760.

Adding to 10521218 its reverse (81212501), we get a palindrome (91733719).

The spelling of 10521218 in words is "ten million, five hundred twenty-one thousand, two hundred eighteen".