21112010220173 has 2 divisors, whose sum is σ = 21112010220174. Its totient is φ = 21112010220172.

The previous prime is 21112010220149. The next prime is 21112010220239. The reversal of 21112010220173 is 37102201021112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19665482038084 + 1446528182089 = 4434578^2 + 1202717^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112010220173 - 2³⁰ = 21110936478349 is a prime.

It is a super-2 number, since 2×21112010220173² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112010220373) 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, 10556005110086 + 10556005110087.

It is an arithmetic number, because the mean of its divisors is an integer number (10556005110087).

Almost surely, 2^{21112010220173} is an apocalyptic number.

It is an amenable number.

21112010220173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112010220173 is an equidigital number, since it uses as much as digits as its factorization.

21112010220173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

Adding to 21112010220173 its reverse (37102201021112), we get a palindrome (58214211241285).

The spelling of 21112010220173 in words is "twenty-one trillion, one hundred twelve billion, ten million, two hundred twenty thousand, one hundred seventy-three".