121100211201111 has 4 divisors (see below), whose sum is σ = 161466948268152. Its totient is φ = 80733474134072.

The previous prime is 121100211201097. The next prime is 121100211201113. The reversal of 121100211201111 is 111102112001121.

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

It is a cyclic number.

It is not a de Polignac number, because 121100211201111 - 2²³ = 121100202812503 is a prime.

It is a super-2 number, since 2×121100211201111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100211201113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20183368533516 + ... + 20183368533521.

It is an arithmetic number, because the mean of its divisors is an integer number (40366737067038).

Almost surely, 2^{121100211201111} is an apocalyptic number.

121100211201111 is a deficient number, since it is larger than the sum of its proper divisors (40366737067041).

121100211201111 is an equidigital number, since it uses as much as digits as its factorization.

121100211201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40366737067040.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 121100211201111 its reverse (111102112001121), we get a palindrome (232202323202232).

The spelling of 121100211201111 in words is "one hundred twenty-one trillion, one hundred billion, two hundred eleven million, two hundred one thousand, one hundred eleven".