22001021173 has 2 divisors, whose sum is σ = 22001021174. Its totient is φ = 22001021172.

The previous prime is 22001021051. The next prime is 22001021213. The reversal of 22001021173 is 37112010022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19582643844 + 2418377329 = 139938^2 + 49177^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22001021173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22001021173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22001081173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11000510586 + 11000510587.

It is an arithmetic number, because the mean of its divisors is an integer number (11000510587).

Almost surely, 2^22001021173 is an apocalyptic number.

It is an amenable number.

22001021173 is a deficient number, since it is larger than the sum of its proper divisors (1).

22001021173 is an equidigital number, since it uses as much as digits as its factorization.

22001021173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

Adding to 22001021173 its reverse (37112010022), we get a palindrome (59113031195).

The spelling of 22001021173 in words is "twenty-two billion, one million, twenty-one thousand, one hundred seventy-three".