121111100121 has 16 divisors (see below), whose sum is σ = 176614476480. Its totient is φ = 73211968320.

The previous prime is 121111100119. The next prime is 121111100129. The reversal of 121111100121 is 121001111121.

It is not a de Polignac number, because 121111100121 - 2¹ = 121111100119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121111100097 and 121111100106.

It is not an unprimeable number, because it can be changed into a prime (121111100129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4704430 + ... + 4730103.

It is an arithmetic number, because the mean of its divisors is an integer number (11038404780).

Almost surely, 2^121111100121 is an apocalyptic number.

121111100121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121111100121 is a deficient number, since it is larger than the sum of its proper divisors (55503376359).

121111100121 is a wasteful number, since it uses less digits than its factorization.

121111100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9434936.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121111100121 its reverse (121001111121), we get a palindrome (242112211242).

The spelling of 121111100121 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred thousand, one hundred twenty-one".