11021111261 has 2 divisors, whose sum is σ = 11021111262. Its totient is φ = 11021111260.

The previous prime is 11021111221. The next prime is 11021111267. The reversal of 11021111261 is 16211112011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7199522500 + 3821588761 = 84850^2 + 61819^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11021111261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11021111267) 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, 5510555630 + 5510555631.

It is an arithmetic number, because the mean of its divisors is an integer number (5510555631).

Almost surely, 2^11021111261 is an apocalyptic number.

It is an amenable number.

11021111261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11021111261 is an equidigital number, since it uses as much as digits as its factorization.

11021111261 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 11021111261 its reverse (16211112011), we get a palindrome (27232223272).

The spelling of 11021111261 in words is "eleven billion, twenty-one million, one hundred eleven thousand, two hundred sixty-one".