10186821 has 6 divisors (see below), whose sum is σ = 14714310. Its totient is φ = 6791208.

The previous prime is 10186811. The next prime is 10186823. The reversal of 10186821 is 12868101.

It can be written as a sum of positive squares in only one way, i.e., 8468100 + 1718721 = 2910^2 + 1311^2 .

It is not a de Polignac number, because 10186821 - 2⁵ = 10186789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10186823) 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 5 ways as a sum of consecutive naturals, for example, 565926 + ... + 565943.

It is an arithmetic number, because the mean of its divisors is an integer number (2452385).

Almost surely, 2^10186821 is an apocalyptic number.

It is an amenable number.

10186821 is a deficient number, since it is larger than the sum of its proper divisors (4527489).

10186821 is a wasteful number, since it uses less digits than its factorization.

10186821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131875 (or 1131872 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 10186821 is about 3191.6799651594. The cubic root of 10186821 is about 216.7768452121.

The spelling of 10186821 in words is "ten million, one hundred eighty-six thousand, eight hundred twenty-one".