11212104221 has 2 divisors, whose sum is σ = 11212104222. Its totient is φ = 11212104220.

The previous prime is 11212104209. The next prime is 11212104311. The reversal of 11212104221 is 12240121211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6657744025 + 4554360196 = 81595^2 + 67486^2 .

It is a cyclic number.

It is not a de Polignac number, because 11212104221 - 2⁶ = 11212104157 is a prime.

It is a super-2 number, since 2×11212104221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11212104221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11212164221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606052110 + 5606052111.

It is an arithmetic number, because the mean of its divisors is an integer number (5606052111).

Almost surely, 2^11212104221 is an apocalyptic number.

It is an amenable number.

11212104221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11212104221 is an equidigital number, since it uses as much as digits as its factorization.

11212104221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 11212104221 its reverse (12240121211), we get a palindrome (23452225432).

The spelling of 11212104221 in words is "eleven billion, two hundred twelve million, one hundred four thousand, two hundred twenty-one".