21822167173 has 2 divisors, whose sum is σ = 21822167174. Its totient is φ = 21822167172.

The previous prime is 21822167149. The next prime is 21822167177. The reversal of 21822167173 is 37176122812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17146069249 + 4676097924 = 130943^2 + 68382^2 .

It is a cyclic number.

It is not a de Polignac number, because 21822167173 - 2⁹ = 21822166661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21822167177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10911083586 + 10911083587.

It is an arithmetic number, because the mean of its divisors is an integer number (10911083587).

Almost surely, 2^21822167173 is an apocalyptic number.

It is an amenable number.

21822167173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21822167173 is an equidigital number, since it uses as much as digits as its factorization.

21822167173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

Adding to 21822167173 its reverse (37176122812), we get a palindrome (58998289985).

The spelling of 21822167173 in words is "twenty-one billion, eight hundred twenty-two million, one hundred sixty-seven thousand, one hundred seventy-three".