121431132420243 has 16 divisors (see below), whose sum is σ = 162200134553760. Its totient is φ = 80808111577856.

The previous prime is 121431132420209. The next prime is 121431132420263. The reversal of 121431132420243 is 342024231134121.

It is a cyclic number.

It is not a de Polignac number, because 121431132420243 - 2²⁹ = 121430595549331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121431132420263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316357423 + ... + 316741031.

It is an arithmetic number, because the mean of its divisors is an integer number (10137508409610).

Almost surely, 2^{121431132420243} is an apocalyptic number.

121431132420243 is a deficient number, since it is larger than the sum of its proper divisors (40769002133517).

121431132420243 is a wasteful number, since it uses less digits than its factorization.

121431132420243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573606.

The product of its (nonzero) digits is 27648, while the sum is 33.

Adding to 121431132420243 its reverse (342024231134121), we get a palindrome (463455363554364).

The spelling of 121431132420243 in words is "one hundred twenty-one trillion, four hundred thirty-one billion, one hundred thirty-two million, four hundred twenty thousand, two hundred forty-three".