10518821 has 4 divisors (see below), whose sum is σ = 10637100. Its totient is φ = 10400544.

The previous prime is 10518817. The next prime is 10518853. The reversal of 10518821 is 12881501.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6558721 + 3960100 = 2561^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 10518821 - 2² = 10518817 is a prime.

It is a super-2 number, since 2×10518821² = 221291190460082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10518881) by changing a digit.

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, 59006 + ... + 59183.

It is an arithmetic number, because the mean of its divisors is an integer number (2659275).

Almost surely, 2^10518821 is an apocalyptic number.

It is an amenable number.

10518821 is a deficient number, since it is larger than the sum of its proper divisors (118279).

10518821 is an equidigital number, since it uses as much as digits as its factorization.

10518821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118278.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 10518821 is about 3243.2731923167. The cubic root of 10518821 is about 219.1067152948.

The spelling of 10518821 in words is "ten million, five hundred eighteen thousand, eight hundred twenty-one".