11111121101 has 4 divisors (see below), whose sum is σ = 11112465372. Its totient is φ = 11109776832.

The previous prime is 11111121041. The next prime is 11111121121. The reversal of 11111121101 is 10112111111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10112111111 = 5351 ⋅1889761.

It can be written as a sum of positive squares in 2 ways, for example, as 7362498025 + 3748623076 = 85805^2 + 61226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111121101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111121121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659660 + ... + 676293.

It is an arithmetic number, because the mean of its divisors is an integer number (2778116343).

Almost surely, 2^11111121101 is an apocalyptic number.

It is an amenable number.

11111121101 is a deficient number, since it is larger than the sum of its proper divisors (1344271).

11111121101 is an equidigital number, since it uses as much as digits as its factorization.

11111121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344270.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 11111121101 its reverse (10112111111), we get a palindrome (21223232212).

The spelling of 11111121101 in words is "eleven billion, one hundred eleven million, one hundred twenty-one thousand, one hundred one".