10317821 has 2 divisors, whose sum is σ = 10317822. Its totient is φ = 10317820.

The previous prime is 10317809. The next prime is 10317829. The reversal of 10317821 is 12871301.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10272025 + 45796 = 3205^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 10317821 - 2⁶ = 10317757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10317829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5158910 + 5158911.

It is an arithmetic number, because the mean of its divisors is an integer number (5158911).

Almost surely, 2^10317821 is an apocalyptic number.

It is an amenable number.

10317821 is a deficient number, since it is larger than the sum of its proper divisors (1).

10317821 is an equidigital number, since it uses as much as digits as its factorization.

10317821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 10317821 is about 3212.1365164015. The cubic root of 10317821 is about 217.7021224106.

The spelling of 10317821 in words is "ten million, three hundred seventeen thousand, eight hundred twenty-one".