10669721 has 2 divisors, whose sum is σ = 10669722. Its totient is φ = 10669720.

The previous prime is 10669699. The next prime is 10669739. The reversal of 10669721 is 12796601.

It is a happy number.

10669721 is digitally balanced in base 2, because in such base 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., 10471696 + 198025 = 3236^2 + 445^2 .

It is an emirp because it is prime and its reverse (12796601) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10669721 - 2⁶ = 10669657 is a prime.

It is a super-2 number, since 2×10669721² = 227685892435682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10669751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5334860 + 5334861.

It is an arithmetic number, because the mean of its divisors is an integer number (5334861).

Almost surely, 2^10669721 is an apocalyptic number.

It is an amenable number.

10669721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10669721 is an equidigital number, since it uses as much as digits as its factorization.

10669721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 10669721 is about 3266.4538876280. The cubic root of 10669721 is about 220.1494920596.

The spelling of 10669721 in words is "ten million, six hundred sixty-nine thousand, seven hundred twenty-one".