221220220073 has 2 divisors, whose sum is σ = 221220220074. Its totient is φ = 221220220072.

The previous prime is 221220220031. The next prime is 221220220121. The reversal of 221220220073 is 370022022122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135131965609 + 86088254464 = 367603^2 + 293408^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220220073 - 2⁸ = 221220219817 is a prime.

It is not a weakly prime, because it can be changed into another prime (221220210073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110610110036 + 110610110037.

It is an arithmetic number, because the mean of its divisors is an integer number (110610110037).

Almost surely, 2^221220220073 is an apocalyptic number.

It is an amenable number.

221220220073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221220220073 is an equidigital number, since it uses as much as digits as its factorization.

221220220073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 23.

Adding to 221220220073 its reverse (370022022122), we get a palindrome (591242242195).

The spelling of 221220220073 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred twenty thousand, seventy-three".