11211011016221 has 2 divisors, whose sum is σ = 11211011016222. Its totient is φ = 11211011016220.

The previous prime is 11211011016209. The next prime is 11211011016259. The reversal of 11211011016221 is 12261011011211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10798545220996 + 412465795225 = 3286114^2 + 642235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211011016221 is a prime.

It is a super-3 number, since 3×11211011016221³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11211011016193 and 11211011016202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211011016281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605505508110 + 5605505508111.

It is an arithmetic number, because the mean of its divisors is an integer number (5605505508111).

Almost surely, 2^{11211011016221} is an apocalyptic number.

It is an amenable number.

11211011016221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211011016221 is an equidigital number, since it uses as much as digits as its factorization.

11211011016221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 11211011016221 its reverse (12261011011211), we get a palindrome (23472022027432).

The spelling of 11211011016221 in words is "eleven trillion, two hundred eleven billion, eleven million, sixteen thousand, two hundred twenty-one".