22170121 has 2 divisors, whose sum is σ = 22170122. Its totient is φ = 22170120.

The previous prime is 22170107. The next prime is 22170133. The reversal of 22170121 is 12107122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 1784896 = 4515^2 + 1336^2 .

It is a cyclic number.

It is not a de Polignac number, because 22170121 - 2¹¹ = 22168073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22170095 and 22170104.

It is not a weakly prime, because it can be changed into another prime (22170101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11085060 + 11085061.

It is an arithmetic number, because the mean of its divisors is an integer number (11085061).

Almost surely, 2^22170121 is an apocalyptic number.

It is an amenable number.

22170121 is a deficient number, since it is larger than the sum of its proper divisors (1).

22170121 is an equidigital number, since it uses as much as digits as its factorization.

22170121 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 22170121 is about 4708.5157958745. The cubic root of 22170121 is about 280.9243304649.

Adding to 22170121 its reverse (12107122), we get a palindrome (34277243).

The spelling of 22170121 in words is "twenty-two million, one hundred seventy thousand, one hundred twenty-one".