211321213057 has 2 divisors, whose sum is σ = 211321213058. Its totient is φ = 211321213056.

The previous prime is 211321213031. The next prime is 211321213087. The reversal of 211321213057 is 750312123112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130690203121 + 80631009936 = 361511^2 + 283956^2 .

It is a cyclic number.

It is not a de Polignac number, because 211321213057 - 2¹¹ = 211321211009 is a prime.

It is not a weakly prime, because it can be changed into another prime (211321213027) 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, 105660606528 + 105660606529.

It is an arithmetic number, because the mean of its divisors is an integer number (105660606529).

Almost surely, 2^211321213057 is an apocalyptic number.

It is an amenable number.

211321213057 is a deficient number, since it is larger than the sum of its proper divisors (1).

211321213057 is an equidigital number, since it uses as much as digits as its factorization.

211321213057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 211321213057 its reverse (750312123112), we get a palindrome (961633336169).

The spelling of 211321213057 in words is "two hundred eleven billion, three hundred twenty-one million, two hundred thirteen thousand, fifty-seven".