121242432431 has 4 divisors (see below), whose sum is σ = 121243232664. Its totient is φ = 121241632200.

The previous prime is 121242432419. The next prime is 121242432439. The reversal of 121242432431 is 134234242121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121242432431 - 2¹⁰ = 121242431407 is a prime.

It is a super-2 number, since 2×121242432431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121242432394 and 121242432403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121242432439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95600 + ... + 501621.

It is an arithmetic number, because the mean of its divisors is an integer number (30310808166).

Almost surely, 2^121242432431 is an apocalyptic number.

121242432431 is a deficient number, since it is larger than the sum of its proper divisors (800233).

121242432431 is an equidigital number, since it uses as much as digits as its factorization.

121242432431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800232.

The product of its digits is 9216, while the sum is 29.

Adding to 121242432431 its reverse (134234242121), we get a palindrome (255476674552).

The spelling of 121242432431 in words is "one hundred twenty-one billion, two hundred forty-two million, four hundred thirty-two thousand, four hundred thirty-one".