2221121102173 has 2 divisors, whose sum is σ = 2221121102174. Its totient is φ = 2221121102172.

The previous prime is 2221121102113. The next prime is 2221121102197. The reversal of 2221121102173 is 3712011211222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2089129125924 + 131991976249 = 1445382^2 + 363307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221121102173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221121102113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110560551086 + 1110560551087.

It is an arithmetic number, because the mean of its divisors is an integer number (1110560551087).

Almost surely, 2^{2221121102173} is an apocalyptic number.

It is an amenable number.

2221121102173 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221121102173 is an equidigital number, since it uses as much as digits as its factorization.

2221121102173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

Adding to 2221121102173 its reverse (3712011211222), we get a palindrome (5933132313395).

The spelling of 2221121102173 in words is "two trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred two thousand, one hundred seventy-three".