21112211220073 has 2 divisors, whose sum is σ = 21112211220074. Its totient is φ = 21112211220072.

The previous prime is 21112211220071. The next prime is 21112211220109. The reversal of 21112211220073 is 37002211221112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21069091451664 + 43119768409 = 4590108^2 + 207653^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112211220073 - 2¹ = 21112211220071 is a prime.

Together with 21112211220071, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21112211220071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556105610036 + 10556105610037.

It is an arithmetic number, because the mean of its divisors is an integer number (10556105610037).

Almost surely, 2^{21112211220073} is an apocalyptic number.

It is an amenable number.

21112211220073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112211220073 is an equidigital number, since it uses as much as digits as its factorization.

21112211220073 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 25.

Adding to 21112211220073 its reverse (37002211221112), we get a palindrome (58114422441185).

The spelling of 21112211220073 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, two hundred twenty thousand, seventy-three".