121105556121 has 16 divisors (see below), whose sum is σ = 176884475328. Its totient is φ = 73092748800.

The previous prime is 121105556119. The next prime is 121105556123. The reversal of 121105556121 is 121655501121.

It is an interprime number because it is at equal distance from previous prime (121105556119) and next prime (121105556123).

It is not a de Polignac number, because 121105556121 - 2¹ = 121105556119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121105556123) 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, 7605876 + ... + 7621781.

It is an arithmetic number, because the mean of its divisors is an integer number (11055279708).

Almost surely, 2^121105556121 is an apocalyptic number.

121105556121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121105556121 is a deficient number, since it is larger than the sum of its proper divisors (55778919207).

121105556121 is a wasteful number, since it uses less digits than its factorization.

121105556121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15227912.

The product of its (nonzero) digits is 3000, while the sum is 30.

The spelling of 121105556121 in words is "one hundred twenty-one billion, one hundred five million, five hundred fifty-six thousand, one hundred twenty-one".