10671821 has 2 divisors, whose sum is σ = 10671822. Its totient is φ = 10671820.

The previous prime is 10671811. The next prime is 10671823. The reversal of 10671821 is 12817601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 1755625 = 2986^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 10671821 - 2¹⁰ = 10670797 is a prime.

It is a super-2 number, since 2×10671821² = 227775526912082, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 10671823, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10671823) 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 as a sum of consecutive naturals, namely, 5335910 + 5335911.

It is an arithmetic number, because the mean of its divisors is an integer number (5335911).

Almost surely, 2^10671821 is an apocalyptic number.

It is an amenable number.

10671821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10671821 is an equidigital number, since it uses as much as digits as its factorization.

10671821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 10671821 is about 3266.7753213222. The cubic root of 10671821 is about 220.1639342869.

The spelling of 10671821 in words is "ten million, six hundred seventy-one thousand, eight hundred twenty-one".