22021001173 has 2 divisors, whose sum is σ = 22021001174. Its totient is φ = 22021001172.

The previous prime is 22021001099. The next prime is 22021001179. The reversal of 22021001173 is 37110012022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14839625124 + 7181376049 = 121818^2 + 84743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22021001173 is a prime.

It is a super-2 number, since 2×22021001173² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22021001173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021001179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11010500586 + 11010500587.

It is an arithmetic number, because the mean of its divisors is an integer number (11010500587).

Almost surely, 2^22021001173 is an apocalyptic number.

It is an amenable number.

22021001173 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021001173 is an equidigital number, since it uses as much as digits as its factorization.

22021001173 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 19.

Adding to 22021001173 its reverse (37110012022), we get a palindrome (59131013195).

The spelling of 22021001173 in words is "twenty-two billion, twenty-one million, one thousand, one hundred seventy-three".