121242403021 has 8 divisors (see below), whose sum is σ = 129599515584. Its totient is φ = 113142432480.

The previous prime is 121242403019. The next prime is 121242403031. The reversal of 121242403021 is 120304242121.

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 121242403021 - 2¹ = 121242403019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121242402983 and 121242403001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242403031) 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 7 ways as a sum of consecutive naturals, for example, 64284531 + ... + 64286416.

It is an arithmetic number, because the mean of its divisors is an integer number (16199939448).

Almost surely, 2^121242403021 is an apocalyptic number.

It is an amenable number.

121242403021 is a deficient number, since it is larger than the sum of its proper divisors (8357112563).

121242403021 is a wasteful number, since it uses less digits than its factorization.

121242403021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128571011.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 121242403021 its reverse (120304242121), we get a palindrome (241546645142).

The spelling of 121242403021 in words is "one hundred twenty-one billion, two hundred forty-two million, four hundred three thousand, twenty-one".