10664221 has 2 divisors, whose sum is σ = 10664222. Its totient is φ = 10664220.

The previous prime is 10664209. The next prime is 10664243. The reversal of 10664221 is 12246601.

10664221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (10664243) can be obtained adding 10664221 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6708100 + 3956121 = 2590^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 10664221 - 2²³ = 2275613 is a prime.

It is a super-2 number, since 2×10664221² = 227451219073682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10664192 and 10664201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10664021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5332110 + 5332111.

It is an arithmetic number, because the mean of its divisors is an integer number (5332111).

Almost surely, 2^10664221 is an apocalyptic number.

It is an amenable number.

10664221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10664221 is an equidigital number, since it uses as much as digits as its factorization.

10664221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 10664221 is about 3265.6118875335. The cubic root of 10664221 is about 220.1116581958. Note that the first 3 decimals are identical.

The spelling of 10664221 in words is "ten million, six hundred sixty-four thousand, two hundred twenty-one".