22165321 has 2 divisors, whose sum is σ = 22165322. Its totient is φ = 22165320.

The previous prime is 22165303. The next prime is 22165327. The reversal of 22165321 is 12356122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 4145296 = 4245^2 + 2036^2 .

It is a cyclic number.

It is not a de Polignac number, because 22165321 - 2¹³ = 22157129 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22165292 and 22165301.

It is not a weakly prime, because it can be changed into another prime (22165327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11082660 + 11082661.

It is an arithmetic number, because the mean of its divisors is an integer number (11082661).

Almost surely, 2^22165321 is an apocalyptic number.

It is an amenable number.

22165321 is a deficient number, since it is larger than the sum of its proper divisors (1).

22165321 is an equidigital number, since it uses as much as digits as its factorization.

22165321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 22165321 is about 4708.0060535220. The cubic root of 22165321 is about 280.9040549161.

The spelling of 22165321 in words is "twenty-two million, one hundred sixty-five thousand, three hundred twenty-one".