11211011261 has 2 divisors, whose sum is σ = 11211011262. Its totient is φ = 11211011260.

The previous prime is 11211011243. The next prime is 11211011303. The reversal of 11211011261 is 16211011211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10367108761 + 843902500 = 101819^2 + 29050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211011261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211511261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605505630 + 5605505631.

It is an arithmetic number, because the mean of its divisors is an integer number (5605505631).

Almost surely, 2^11211011261 is an apocalyptic number.

It is an amenable number.

11211011261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211011261 is an equidigital number, since it uses as much as digits as its factorization.

11211011261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 11211011261 its reverse (16211011211), we get a palindrome (27422022472).

The spelling of 11211011261 in words is "eleven billion, two hundred eleven million, eleven thousand, two hundred sixty-one".