10172221 has 2 divisors, whose sum is σ = 10172222.
Its totient is φ = 10172220.
The previous prime is 10172219. The next prime is 10172321. The reversal of 10172221 is 12227101.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 10169721 + 2500 = 3189^2 + 50^2
It is a cyclic number.
It is not a de Polignac number, because 10172221 - 21 = 10172219 is a prime.
Together with 10172219, it forms a pair of twin primes.
It is a junction number, because it is equal to n+sod(n) for n = 10172195 and 10172204.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (10172021) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5086110 + 5086111.
It is an arithmetic number, because the mean of its divisors is an integer number (5086111).
Almost surely, 210172221 is an apocalyptic number.
It is an amenable number.
10172221 is a deficient number, since it is larger than the sum of its proper divisors (1).
10172221 is an equidigital number, since it uses as much as digits as its factorization.
10172221 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 56, while the sum is 16.
The square root of 10172221 is about 3189.3919483187.
The cubic root of 10172221 is about 216.6732324112.
Adding to 10172221 its reverse (12227101), we get a palindrome (22399322).
The spelling of 10172221 in words is "ten million, one hundred seventy-two thousand, two hundred twenty-one".