121111111122101 has 4 divisors (see below), whose sum is σ = 121111153694304. Its totient is φ = 121111068549900.

The previous prime is 121111111122073. The next prime is 121111111122109. The reversal of 121111111122101 is 101221111111121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121111111122101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121111111122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111111122109) 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, 16687715 + ... + 22818896.

It is an arithmetic number, because the mean of its divisors is an integer number (30277788423576).

Almost surely, 2^{121111111122101} is an apocalyptic number.

It is an amenable number.

121111111122101 is a deficient number, since it is larger than the sum of its proper divisors (42572203).

121111111122101 is an equidigital number, since it uses as much as digits as its factorization.

121111111122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42572202.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 121111111122101 its reverse (101221111111121), we get a palindrome (222332222233222).

The spelling of 121111111122101 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, one hundred twenty-two thousand, one hundred one".