211020112021261 has 2 divisors, whose sum is σ = 211020112021262. Its totient is φ = 211020112021260.

The previous prime is 211020112021217. The next prime is 211020112021307. The reversal of 211020112021261 is 162120211020112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111714203416036 + 99305908605225 = 10569494^2 + 9965235^2 .

It is a cyclic number.

It is not a de Polignac number, because 211020112021261 - 2¹³ = 211020112013069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211020112621261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105510056010630 + 105510056010631.

It is an arithmetic number, because the mean of its divisors is an integer number (105510056010631).

Almost surely, 2^{211020112021261} is an apocalyptic number.

It is an amenable number.

211020112021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

211020112021261 is an equidigital number, since it uses as much as digits as its factorization.

211020112021261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 211020112021261 its reverse (162120211020112), we get a palindrome (373140323041373).

The spelling of 211020112021261 in words is "two hundred eleven trillion, twenty billion, one hundred twelve million, twenty-one thousand, two hundred sixty-one".