22204661 has 2 divisors, whose sum is σ = 22204662. Its totient is φ = 22204660.

The previous prime is 22204639. The next prime is 22204681. The reversal of 22204661 is 16640222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11771761 + 10432900 = 3431^2 + 3230^2 .

It is a cyclic number.

It is not a de Polignac number, because 22204661 - 2¹⁰ = 22203637 is a prime.

It is a Chen prime.

It is equal to p_1401278 and since 22204661 and 1401278 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11102330 + 11102331.

It is an arithmetic number, because the mean of its divisors is an integer number (11102331).

Almost surely, 2^22204661 is an apocalyptic number.

It is an amenable number.

22204661 is a deficient number, since it is larger than the sum of its proper divisors (1).

22204661 is an equidigital number, since it uses as much as digits as its factorization.

22204661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 22204661 is about 4712.1821908751. The cubic root of 22204661 is about 281.0701437080.

Adding to 22204661 its reverse (16640222), we get a palindrome (38844883).

The spelling of 22204661 in words is "twenty-two million, two hundred four thousand, six hundred sixty-one".