22160221 has 2 divisors, whose sum is σ = 22160222. Its totient is φ = 22160220.

The previous prime is 22160219. The next prime is 22160227. The reversal of 22160221 is 12206122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15327225 + 6832996 = 3915^2 + 2614^2 .

It is a cyclic number.

It is not a de Polignac number, because 22160221 - 2¹ = 22160219 is a prime.

Together with 22160219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 22160195 and 22160204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22160227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11080110 + 11080111.

It is an arithmetic number, because the mean of its divisors is an integer number (11080111).

Almost surely, 2^22160221 is an apocalyptic number.

It is an amenable number.

22160221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22160221 is an equidigital number, since it uses as much as digits as its factorization.

22160221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 22160221 is about 4707.4643917931. The cubic root of 22160221 is about 280.8825089378.

Adding to 22160221 its reverse (12206122), we get a palindrome (34366343).

The spelling of 22160221 in words is "twenty-two million, one hundred sixty thousand, two hundred twenty-one".