121009005 has 96 divisors (see below), whose sum is σ = 245790720. Its totient is φ = 56142720.

The previous prime is 121009001. The next prime is 121009013. The reversal of 121009005 is 500900121.

It is not a de Polignac number, because 121009005 - 2² = 121009001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121009001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 633460 + ... + 633650.

It is an arithmetic number, because the mean of its divisors is an integer number (2560320).

Almost surely, 2^121009005 is an apocalyptic number.

121009005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121009005 is an abundant number, since it is smaller than the sum of its proper divisors (124781715).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121009005 is a wasteful number, since it uses less digits than its factorization.

121009005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 121009005 is about 11000.4093105666. The cubic root of 121009005 is about 494.6210138600.

Adding to 121009005 its reverse (500900121), we get a palindrome (621909126).

The spelling of 121009005 in words is "one hundred twenty-one million, nine thousand, five".