10691321 has 2 divisors, whose sum is σ = 10691322. Its totient is φ = 10691320.

The previous prime is 10691293. The next prime is 10691327. The reversal of 10691321 is 12319601.

It is a happy number.

10691321 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6943225 + 3748096 = 2635^2 + 1936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10691321 is a prime.

It is a super-2 number, since 2×10691321² = 228608689450082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10691327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5345660 + 5345661.

It is an arithmetic number, because the mean of its divisors is an integer number (5345661).

Almost surely, 2^10691321 is an apocalyptic number.

It is an amenable number.

10691321 is a deficient number, since it is larger than the sum of its proper divisors (1).

10691321 is an equidigital number, since it uses as much as digits as its factorization.

10691321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 10691321 is about 3269.7585537773. The cubic root of 10691321 is about 220.2979502924.

The spelling of 10691321 in words is "ten million, six hundred ninety-one thousand, three hundred twenty-one".