221328007 has 2 divisors, whose sum is σ = 221328008. Its totient is φ = 221328006.

The previous prime is 221327993. The next prime is 221328061. The reversal of 221328007 is 700823122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221328007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221328077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110664003 + 110664004.

It is an arithmetic number, because the mean of its divisors is an integer number (110664004).

Almost surely, 2^221328007 is an apocalyptic number.

221328007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221328007 is an equidigital number, since it uses as much as digits as its factorization.

221328007 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 221328007 is about 14877.0967261761. The cubic root of 221328007 is about 604.8933236316.

The spelling of 221328007 in words is "two hundred twenty-one million, three hundred twenty-eight thousand, seven".