1111122101261 has 2 divisors, whose sum is σ = 1111122101262. Its totient is φ = 1111122101260.

The previous prime is 1111122101227. The next prime is 1111122101263. The reversal of 1111122101261 is 1621012211111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984820049161 + 126302052100 = 992381^2 + 355390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111122101261 - 2³⁰ = 1110048359437 is a prime.

Together with 1111122101263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1111122101263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555561050630 + 555561050631.

It is an arithmetic number, because the mean of its divisors is an integer number (555561050631).

Almost surely, 2^{1111122101261} is an apocalyptic number.

It is an amenable number.

1111122101261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111122101261 is an equidigital number, since it uses as much as digits as its factorization.

1111122101261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 20.

Adding to 1111122101261 its reverse (1621012211111), we get a palindrome (2732134312372).

The spelling of 1111122101261 in words is "one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred one thousand, two hundred sixty-one".