11421101156221 has 2 divisors, whose sum is σ = 11421101156222. Its totient is φ = 11421101156220.

The previous prime is 11421101156197. The next prime is 11421101156279. The reversal of 11421101156221 is 12265110112411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11099651844996 + 321449311225 = 3331614^2 + 566965^2 .

It is a cyclic number.

It is not a de Polignac number, because 11421101156221 - 2¹³ = 11421101148029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11421101156221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11421101156921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710550578110 + 5710550578111.

It is an arithmetic number, because the mean of its divisors is an integer number (5710550578111).

Almost surely, 2^{11421101156221} is an apocalyptic number.

It is an amenable number.

11421101156221 is a deficient number, since it is larger than the sum of its proper divisors (1).

11421101156221 is an equidigital number, since it uses as much as digits as its factorization.

11421101156221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 28.

Adding to 11421101156221 its reverse (12265110112411), we get a palindrome (23686211268632).

The spelling of 11421101156221 in words is "eleven trillion, four hundred twenty-one billion, one hundred one million, one hundred fifty-six thousand, two hundred twenty-one".