22204681 has 2 divisors, whose sum is σ = 22204682. Its totient is φ = 22204680.

The previous prime is 22204661. The next prime is 22204697. The reversal of 22204681 is 18640222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11964681 + 10240000 = 3459^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 22204681 - 2¹¹ = 22202633 is a prime.

It is a super-2 number, since 2×22204681² = 986095716623522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22204621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11102340 + 11102341.

It is an arithmetic number, because the mean of its divisors is an integer number (11102341).

Almost surely, 2^22204681 is an apocalyptic number.

It is an amenable number.

22204681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22204681 is an equidigital number, since it uses as much as digits as its factorization.

22204681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 22204681 is about 4712.1843130336. The cubic root of 22204681 is about 281.0702280957.

The spelling of 22204681 in words is "twenty-two million, two hundred four thousand, six hundred eighty-one".