11971321 has 2 divisors, whose sum is σ = 11971322. Its totient is φ = 11971320.

The previous prime is 11971261. The next prime is 11971327. The reversal of 11971321 is 12317911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 336400 = 3411^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 11971321 - 2¹¹ = 11969273 is a prime.

It is equal to p₇₈₆₃₀₁ and since 11971321 and 786301 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (11971327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5985660 + 5985661.

It is an arithmetic number, because the mean of its divisors is an integer number (5985661).

Almost surely, 2^11971321 is an apocalyptic number.

It is an amenable number.

11971321 is a deficient number, since it is larger than the sum of its proper divisors (1).

11971321 is an equidigital number, since it uses as much as digits as its factorization.

11971321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378, while the sum is 25.

The square root of 11971321 is about 3459.9596818460. The cubic root of 11971321 is about 228.7603182462.

The spelling of 11971321 in words is "eleven million, nine hundred seventy-one thousand, three hundred twenty-one".