11204042221 has 2 divisors, whose sum is σ = 11204042222. Its totient is φ = 11204042220.

The previous prime is 11204042209. The next prime is 11204042231. The reversal of 11204042221 is 12224040211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10970258121 + 233784100 = 104739^2 + 15290^2 .

It is a cyclic number.

It is not a de Polignac number, because 11204042221 - 2¹¹ = 11204040173 is a prime.

It is a super-2 number, since 2×11204042221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11204042231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5602021110 + 5602021111.

It is an arithmetic number, because the mean of its divisors is an integer number (5602021111).

Almost surely, 2^11204042221 is an apocalyptic number.

It is an amenable number.

11204042221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11204042221 is an equidigital number, since it uses as much as digits as its factorization.

11204042221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 11204042221 its reverse (12224040211), we get a palindrome (23428082432).

The spelling of 11204042221 in words is "eleven billion, two hundred four million, forty-two thousand, two hundred twenty-one".