121435203423 has 16 divisors (see below), whose sum is σ = 163204912640. Its totient is φ = 80312052096.

The previous prime is 121435203397. The next prime is 121435203473. The reversal of 121435203423 is 324302534121.

It is not a de Polignac number, because 121435203423 - 2³⁰ = 120361461599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121435203473) 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 15 ways as a sum of consecutive naturals, for example, 428586 + ... + 653112.

It is an arithmetic number, because the mean of its divisors is an integer number (10200307040).

Almost surely, 2^121435203423 is an apocalyptic number.

121435203423 is a deficient number, since it is larger than the sum of its proper divisors (41769709217).

121435203423 is a wasteful number, since it uses less digits than its factorization.

121435203423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225966.

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 121435203423 its reverse (324302534121), we get a palindrome (445737737544).

The spelling of 121435203423 in words is "one hundred twenty-one billion, four hundred thirty-five million, two hundred three thousand, four hundred twenty-three".