22171001 has 2 divisors, whose sum is σ = 22171002. Its totient is φ = 22171000.

The previous prime is 22170997. The next prime is 22171003. The reversal of 22171001 is 10017122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12709225 + 9461776 = 3565^2 + 3076^2 .

It is a cyclic number.

It is not a de Polignac number, because 22171001 - 2² = 22170997 is a prime.

Together with 22171003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22171003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11085500 + 11085501.

It is an arithmetic number, because the mean of its divisors is an integer number (11085501).

Almost surely, 2^22171001 is an apocalyptic number.

It is an amenable number.

22171001 is a deficient number, since it is larger than the sum of its proper divisors (1).

22171001 is an equidigital number, since it uses as much as digits as its factorization.

22171001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 22171001 is about 4708.6092426533. The cubic root of 22171001 is about 280.9280473314.

Adding to 22171001 its reverse (10017122), we get a palindrome (32188123).

The spelling of 22171001 in words is "twenty-two million, one hundred seventy-one thousand, one".