121305204021 has 8 divisors (see below), whose sum is σ = 161923446880. Its totient is φ = 80778548592.

The previous prime is 121305203977. The next prime is 121305204023. The reversal of 121305204021 is 120402503121.

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

It is not a de Polignac number, because 121305204021 - 2¹¹ = 121305201973 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121305204023) 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, 22893766 + ... + 22899063.

It is an arithmetic number, because the mean of its divisors is an integer number (20240430860).

Almost surely, 2^121305204021 is an apocalyptic number.

It is an amenable number.

121305204021 is a deficient number, since it is larger than the sum of its proper divisors (40618242859).

121305204021 is an equidigital number, since it uses as much as digits as its factorization.

121305204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45793715.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 121305204021 its reverse (120402503121), we get a palindrome (241707707142).

The spelling of 121305204021 in words is "one hundred twenty-one billion, three hundred five million, two hundred four thousand, twenty-one".