121321135109 has 16 divisors (see below), whose sum is σ = 126982840320. Its totient is φ = 115824012720.

The previous prime is 121321135097. The next prime is 121321135213. The reversal of 121321135109 is 901531123121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121321135109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321135709) 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, 111344 + ... + 505014.

It is an arithmetic number, because the mean of its divisors is an integer number (7936427520).

Almost surely, 2^121321135109 is an apocalyptic number.

It is an amenable number.

121321135109 is a deficient number, since it is larger than the sum of its proper divisors (5661705211).

121321135109 is an equidigital number, since it uses as much as digits as its factorization.

121321135109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393880.

The product of its (nonzero) digits is 1620, while the sum is 29.

The spelling of 121321135109 in words is "one hundred twenty-one billion, three hundred twenty-one million, one hundred thirty-five thousand, one hundred nine".