11211022210261 has 2 divisors, whose sum is σ = 11211022210262. Its totient is φ = 11211022210260.

The previous prime is 11211022210163. The next prime is 11211022210273. The reversal of 11211022210261 is 16201222011211.

11211022210261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10566725422500 + 644296787761 = 3250650^2 + 802681^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211022210261 - 2⁹ = 11211022209749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211022219261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605511105130 + 5605511105131.

It is an arithmetic number, because the mean of its divisors is an integer number (5605511105131).

Almost surely, 2^{11211022210261} is an apocalyptic number.

It is an amenable number.

11211022210261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211022210261 is an equidigital number, since it uses as much as digits as its factorization.

11211022210261 is an evil number, because the sum of its binary digits is even.

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

Adding to 11211022210261 its reverse (16201222011211), we get a palindrome (27412244221472).

The spelling of 11211022210261 in words is "eleven trillion, two hundred eleven billion, twenty-two million, two hundred ten thousand, two hundred sixty-one".