211311010020221 has 2 divisors, whose sum is σ = 211311010020222. Its totient is φ = 211311010020220.

The previous prime is 211311010020191. The next prime is 211311010020317. The reversal of 211311010020221 is 122020010113112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198049723044196 + 13261286976025 = 14073014^2 + 3641605^2 .

It is a cyclic number.

It is not a de Polignac number, because 211311010020221 - 2⁴² = 206912963509117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211311010020221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211311010025221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105655505010110 + 105655505010111.

It is an arithmetic number, because the mean of its divisors is an integer number (105655505010111).

Almost surely, 2^{211311010020221} is an apocalyptic number.

It is an amenable number.

211311010020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211311010020221 is an equidigital number, since it uses as much as digits as its factorization.

211311010020221 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 17.

Adding to 211311010020221 its reverse (122020010113112), we get a palindrome (333331020133333).

The spelling of 211311010020221 in words is "two hundred eleven trillion, three hundred eleven billion, ten million, twenty thousand, two hundred twenty-one".