11221022001221 has 2 divisors, whose sum is σ = 11221022001222. Its totient is φ = 11221022001220.

The previous prime is 11221022001173. The next prime is 11221022001227. The reversal of 11221022001221 is 12210022012211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8756479948225 + 2464542052996 = 2959135^2 + 1569886^2 .

It is an emirp because it is prime and its reverse (12210022012211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11221022001221 - 2²² = 11221017806917 is a prime.

It is a super-2 number, since 2×11221022001221² (a number of 27 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 11221022001221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221022001227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610511000610 + 5610511000611.

It is an arithmetic number, because the mean of its divisors is an integer number (5610511000611).

Almost surely, 2^{11221022001221} is an apocalyptic number.

It is an amenable number.

11221022001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221022001221 is an equidigital number, since it uses as much as digits as its factorization.

11221022001221 is an evil number, because the sum of its binary digits is even.

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

Adding to 11221022001221 its reverse (12210022012211), we get a palindrome (23431044013432).

The spelling of 11221022001221 in words is "eleven trillion, two hundred twenty-one billion, twenty-two million, one thousand, two hundred twenty-one".