221443007 has 2 divisors, whose sum is σ = 221443008. Its totient is φ = 221443006.

The previous prime is 221442997. The next prime is 221443051. The reversal of 221443007 is 700344122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221443007 - 2⁸ = 221442751 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221440007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110721503 + 110721504.

It is an arithmetic number, because the mean of its divisors is an integer number (110721504).

Almost surely, 2^221443007 is an apocalyptic number.

221443007 is a deficient number, since it is larger than the sum of its proper divisors (1).

221443007 is an equidigital number, since it uses as much as digits as its factorization.

221443007 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 23.

The square root of 221443007 is about 14880.9612256736. The cubic root of 221443007 is about 604.9980711639.

Adding to 221443007 its reverse (700344122), we get a palindrome (921787129).

The spelling of 221443007 in words is "two hundred twenty-one million, four hundred forty-three thousand, seven".