211200022100261 has 2 divisors, whose sum is σ = 211200022100262. Its totient is φ = 211200022100260.

The previous prime is 211200022100257. The next prime is 211200022100267. The reversal of 211200022100261 is 162001220002112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190670115472225 + 20529906628036 = 13808335^2 + 4530994^2 .

It is a cyclic number.

It is not a de Polignac number, because 211200022100261 - 2² = 211200022100257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211200022100267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600011050130 + 105600011050131.

It is an arithmetic number, because the mean of its divisors is an integer number (105600011050131).

Almost surely, 2^{211200022100261} is an apocalyptic number.

It is an amenable number.

211200022100261 is a deficient number, since it is larger than the sum of its proper divisors (1).

211200022100261 is an equidigital number, since it uses as much as digits as its factorization.

211200022100261 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 20.

Adding to 211200022100261 its reverse (162001220002112), we get a palindrome (373201242102373).

The spelling of 211200022100261 in words is "two hundred eleven trillion, two hundred billion, twenty-two million, one hundred thousand, two hundred sixty-one".