221142073 has 2 divisors, whose sum is σ = 221142074. Its totient is φ = 221142072.

The previous prime is 221142071. The next prime is 221142169. The reversal of 221142073 is 370241122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188457984 + 32684089 = 13728^2 + 5717^2 .

It is a cyclic number.

It is not a de Polignac number, because 221142073 - 2¹ = 221142071 is a prime.

Together with 221142071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221142071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571036 + 110571037.

It is an arithmetic number, because the mean of its divisors is an integer number (110571037).

Almost surely, 2^221142073 is an apocalyptic number.

It is an amenable number.

221142073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221142073 is an equidigital number, since it uses as much as digits as its factorization.

221142073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 221142073 is about 14870.8464116875. The cubic root of 221142073 is about 604.7238892158.

Adding to 221142073 its reverse (370241122), we get a palindrome (591383195).

The spelling of 221142073 in words is "two hundred twenty-one million, one hundred forty-two thousand, seventy-three".