121111012121 has 16 divisors (see below), whose sum is σ = 135870177600. Its totient is φ = 107018630400.

The previous prime is 121111012097. The next prime is 121111012123. The reversal of 121111012121 is 121210111121.

It is not a de Polignac number, because 121111012121 - 2¹⁴ = 121110995737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111012096 and 121111012105.

It is not an unprimeable number, because it can be changed into a prime (121111012123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990620 + ... + 1106141.

It is an arithmetic number, because the mean of its divisors is an integer number (8491886100).

Almost surely, 2^121111012121 is an apocalyptic number.

121111012121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121111012121 is a deficient number, since it is larger than the sum of its proper divisors (14759165479).

121111012121 is a wasteful number, since it uses less digits than its factorization.

121111012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2096920.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121111012121 its reverse (121210111121), we get a palindrome (242321123242).

The spelling of 121111012121 in words is "one hundred twenty-one billion, one hundred eleven million, twelve thousand, one hundred twenty-one".