11111111202111 has 8 divisors (see below), whose sum is σ = 15094339746480. Its totient is φ = 7267645062912.

The previous prime is 11111111202097. The next prime is 11111111202211. The reversal of 11111111202111 is 11120211111111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11111111202111 - 2⁹ = 11111111201599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111111202211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34940601106 + ... + 34940601423.

It is an arithmetic number, because the mean of its divisors is an integer number (1886792468310).

Almost surely, 2^{11111111202111} is an apocalyptic number.

11111111202111 is a deficient number, since it is larger than the sum of its proper divisors (3983228544369).

11111111202111 is an equidigital number, since it uses as much as digits as its factorization.

11111111202111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69881202585.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 11111111202111 its reverse (11120211111111), we get a palindrome (22231322313222).

It can be divided in two parts, 11111 and 111202111, that multiplied together give a palindrome (1235566655321).

The spelling of 11111111202111 in words is "eleven trillion, one hundred eleven billion, one hundred eleven million, two hundred two thousand, one hundred eleven".