111211111121101 has 4 divisors (see below), whose sum is σ = 111211451542204. Its totient is φ = 111210770700000.

The previous prime is 111211111121087. The next prime is 111211111121107. The reversal of 111211111121101 is 101121111112111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46385988647076 + 64825122474025 = 6810726^2 + 8051405^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211111121101 - 2⁷ = 111211111120973 is a prime.

It is a super-4 number, since 4×111211111121101⁴ (a number of 57 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211111121107) 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, 169720050 + ... + 170374051.

It is an arithmetic number, because the mean of its divisors is an integer number (27802862885551).

Almost surely, 2^{111211111121101} is an apocalyptic number.

It is an amenable number.

111211111121101 is a deficient number, since it is larger than the sum of its proper divisors (340421103).

111211111121101 is an equidigital number, since it uses as much as digits as its factorization.

111211111121101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340421102.

The product of its (nonzero) digits is 4, while the sum is 16.

Adding to 111211111121101 its reverse (101121111112111), we get a palindrome (212332222233212).

It can be divided in two parts, 11121111112110 and 1, that added together give a palindrome (11121111112111).

The spelling of 111211111121101 in words is "one hundred eleven trillion, two hundred eleven billion, one hundred eleven million, one hundred twenty-one thousand, one hundred one".