11001201021221 has 2 divisors, whose sum is σ = 11001201021222. Its totient is φ = 11001201021220.

The previous prime is 11001201021193. The next prime is 11001201021233. The reversal of 11001201021221 is 12212010210011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9839602070596 + 1161598950625 = 3136814^2 + 1077775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11001201021221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11001201021196 and 11001201021205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11001201021721) 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, 5500600510610 + 5500600510611.

It is an arithmetic number, because the mean of its divisors is an integer number (5500600510611).

Almost surely, 2^{11001201021221} is an apocalyptic number.

It is an amenable number.

11001201021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11001201021221 is an equidigital number, since it uses as much as digits as its factorization.

11001201021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11001201021221 its reverse (12212010210011), we get a palindrome (23213211231232).

The spelling of 11001201021221 in words is "eleven trillion, one billion, two hundred one million, twenty-one thousand, two hundred twenty-one".