211231021321 has 2 divisors, whose sum is σ = 211231021322. Its totient is φ = 211231021320.

The previous prime is 211231021283. The next prime is 211231021361. The reversal of 211231021321 is 123120132112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197968044096 + 13262977225 = 444936^2 + 115165^2 .

It is a cyclic number.

It is not a de Polignac number, because 211231021321 - 2¹³ = 211231013129 is a prime.

It is not a weakly prime, because it can be changed into another prime (211231021361) 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, 105615510660 + 105615510661.

It is an arithmetic number, because the mean of its divisors is an integer number (105615510661).

Almost surely, 2^211231021321 is an apocalyptic number.

It is an amenable number.

211231021321 is a deficient number, since it is larger than the sum of its proper divisors (1).

211231021321 is an equidigital number, since it uses as much as digits as its factorization.

211231021321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 211231021321 its reverse (123120132112), we get a palindrome (334351153433).

The spelling of 211231021321 in words is "two hundred eleven billion, two hundred thirty-one million, twenty-one thousand, three hundred twenty-one".