121018055 has 4 divisors (see below), whose sum is σ = 145221672. Its totient is φ = 96814440.

The previous prime is 121018033. The next prime is 121018063. The reversal of 121018055 is 550810121.

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

It is not a de Polignac number, because 121018055 - 2¹⁰ = 121017031 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 121018055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12101801 + ... + 12101810.

It is an arithmetic number, because the mean of its divisors is an integer number (36305418).

Almost surely, 2^121018055 is an apocalyptic number.

121018055 is a deficient number, since it is larger than the sum of its proper divisors (24203617).

121018055 is an equidigital number, since it uses as much as digits as its factorization.

121018055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24203616.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 121018055 is about 11000.8206512060. The cubic root of 121018055 is about 494.6333440955.

Adding to 121018055 its reverse (550810121), we get a palindrome (671828176).

The spelling of 121018055 in words is "one hundred twenty-one million, eighteen thousand, fifty-five".