221330071 has 2 divisors, whose sum is σ = 221330072. Its totient is φ = 221330070.

The previous prime is 221330051. The next prime is 221330119. The reversal of 221330071 is 170033122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221330071 - 2¹³ = 221321879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221330051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665035 + 110665036.

It is an arithmetic number, because the mean of its divisors is an integer number (110665036).

Almost surely, 2^221330071 is an apocalyptic number.

221330071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330071 is an equidigital number, since it uses as much as digits as its factorization.

221330071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 221330071 is about 14877.1660943877. The cubic root of 221330071 is about 604.8952039418.

Adding to 221330071 its reverse (170033122), we get a palindrome (391363193).

The spelling of 221330071 in words is "two hundred twenty-one million, three hundred thirty thousand, seventy-one".