221311121343173 has 2 divisors, whose sum is σ = 221311121343174. Its totient is φ = 221311121343172.

The previous prime is 221311121343149. The next prime is 221311121343197. The reversal of 221311121343173 is 371343121113122.

It is a balanced prime because it is at equal distance from previous prime (221311121343149) and next prime (221311121343197).

It can be written as a sum of positive squares in only one way, i.e., 218558170066369 + 2752951276804 = 14783713^2 + 1659202^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221311121343173 is a prime.

It is a super-2 number, since 2×221311121343173² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221311121343133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110655560671586 + 110655560671587.

It is an arithmetic number, because the mean of its divisors is an integer number (110655560671587).

Almost surely, 2^{221311121343173} is an apocalyptic number.

It is an amenable number.

221311121343173 is a deficient number, since it is larger than the sum of its proper divisors (1).

221311121343173 is an equidigital number, since it uses as much as digits as its factorization.

221311121343173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

Adding to 221311121343173 its reverse (371343121113122), we get a palindrome (592654242456295).

The spelling of 221311121343173 in words is "two hundred twenty-one trillion, three hundred eleven billion, one hundred twenty-one million, three hundred forty-three thousand, one hundred seventy-three".