22166021 has 2 divisors, whose sum is σ = 22166022. Its totient is φ = 22166020.

The previous prime is 22166017. The next prime is 22166029. The reversal of 22166021 is 12066122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 2937796 = 4385^2 + 1714^2 .

It is a cyclic number.

It is not a de Polignac number, because 22166021 - 2² = 22166017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22165984 and 22166002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22166029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11083010 + 11083011.

It is an arithmetic number, because the mean of its divisors is an integer number (11083011).

Almost surely, 2^22166021 is an apocalyptic number.

It is an amenable number.

22166021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22166021 is an equidigital number, since it uses as much as digits as its factorization.

22166021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 22166021 is about 4708.0803943858. The cubic root of 22166021 is about 280.9070119492.

The spelling of 22166021 in words is "twenty-two million, one hundred sixty-six thousand, twenty-one".