121984005811 has 8 divisors (see below), whose sum is σ = 124354826064. Its totient is φ = 119634641280.

The previous prime is 121984005769. The next prime is 121984005877. The reversal of 121984005811 is 118500489121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121984005811 - 2¹¹ = 121984003763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121984005881) 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 7 ways as a sum of consecutive naturals, for example, 5352450 + ... + 5375191.

It is an arithmetic number, because the mean of its divisors is an integer number (15544353258).

Almost surely, 2^121984005811 is an apocalyptic number.

121984005811 is a deficient number, since it is larger than the sum of its proper divisors (2370820253).

121984005811 is a wasteful number, since it uses less digits than its factorization.

121984005811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10727861.

The product of its (nonzero) digits is 23040, while the sum is 40.

The spelling of 121984005811 in words is "one hundred twenty-one billion, nine hundred eighty-four million, five thousand, eight hundred eleven".