211121321102521 has 2 divisors, whose sum is σ = 211121321102522. Its totient is φ = 211121321102520.

The previous prime is 211121321102509. The next prime is 211121321102551. The reversal of 211121321102521 is 125201123121112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192112462295296 + 19008858807225 = 13860464^2 + 4359915^2 .

It is a cyclic number.

It is not a de Polignac number, because 211121321102521 - 2¹⁵ = 211121321069753 is a prime.

It is not a weakly prime, because it can be changed into another prime (211121321102551) 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, 105560660551260 + 105560660551261.

It is an arithmetic number, because the mean of its divisors is an integer number (105560660551261).

Almost surely, 2^{211121321102521} is an apocalyptic number.

It is an amenable number.

211121321102521 is a deficient number, since it is larger than the sum of its proper divisors (1).

211121321102521 is an equidigital number, since it uses as much as digits as its factorization.

211121321102521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 25.

Adding to 211121321102521 its reverse (125201123121112), we get a palindrome (336322444223633).

The spelling of 211121321102521 in words is "two hundred eleven trillion, one hundred twenty-one billion, three hundred twenty-one million, one hundred two thousand, five hundred twenty-one".