211220010173 has 2 divisors, whose sum is σ = 211220010174. Its totient is φ = 211220010172.

The previous prime is 211220010161. The next prime is 211220010193. The reversal of 211220010173 is 371010022112.

It is an a-pointer prime, because the next prime (211220010193) can be obtained adding 211220010173 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135934528249 + 75285481924 = 368693^2 + 274382^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211220010173 is a prime.

It is a super-2 number, since 2×211220010173² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211220010193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105610005086 + 105610005087.

It is an arithmetic number, because the mean of its divisors is an integer number (105610005087).

Almost surely, 2^211220010173 is an apocalyptic number.

It is an amenable number.

211220010173 is a deficient number, since it is larger than the sum of its proper divisors (1).

211220010173 is an equidigital number, since it uses as much as digits as its factorization.

211220010173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

Adding to 211220010173 its reverse (371010022112), we get a palindrome (582230032285).

The spelling of 211220010173 in words is "two hundred eleven billion, two hundred twenty million, ten thousand, one hundred seventy-three".