221011221073 has 2 divisors, whose sum is σ = 221011221074. Its totient is φ = 221011221072.

The previous prime is 221011221019. The next prime is 221011221157. The reversal of 221011221073 is 370122110122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214154221824 + 6856999249 = 462768^2 + 82807^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221011221073 is a prime.

It is not a weakly prime, because it can be changed into another prime (221011221373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505610536 + 110505610537.

It is an arithmetic number, because the mean of its divisors is an integer number (110505610537).

Almost surely, 2^221011221073 is an apocalyptic number.

It is an amenable number.

221011221073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221011221073 is an equidigital number, since it uses as much as digits as its factorization.

221011221073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

Adding to 221011221073 its reverse (370122110122), we get a palindrome (591133331195).

The spelling of 221011221073 in words is "two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, seventy-three".