121343042421 has 24 divisors (see below), whose sum is σ = 181020902400. Its totient is φ = 78245316000.

The previous prime is 121343042377. The next prime is 121343042449. The reversal of 121343042421 is 124240343121.

121343042421 is a `hidden beast` number, since 1 + 213 + 4 + 3 + 0 + 424 + 21 = 666.

It is not a de Polignac number, because 121343042421 - 2¹⁵ = 121343009653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121343042021) 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 23 ways as a sum of consecutive naturals, for example, 432196 + ... + 655346.

It is an arithmetic number, because the mean of its divisors is an integer number (7542537600).

Almost surely, 2^121343042421 is an apocalyptic number.

It is an amenable number.

121343042421 is a deficient number, since it is larger than the sum of its proper divisors (59677859979).

121343042421 is a wasteful number, since it uses less digits than its factorization.

121343042421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225137 (or 225134 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 121343042421 its reverse (124240343121), we get a palindrome (245583385542).

The spelling of 121343042421 in words is "one hundred twenty-one billion, three hundred forty-three million, forty-two thousand, four hundred twenty-one".