121431204775 has 6 divisors (see below), whose sum is σ = 150574693952. Its totient is φ = 97144963800.

The previous prime is 121431204773. The next prime is 121431204787. The reversal of 121431204775 is 577402134121.

It is not a de Polignac number, because 121431204775 - 2¹ = 121431204773 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 (121431204773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2428624071 + ... + 2428624120.

Almost surely, 2^121431204775 is an apocalyptic number.

121431204775 is a deficient number, since it is larger than the sum of its proper divisors (29143489177).

121431204775 is an equidigital number, since it uses as much as digits as its factorization.

121431204775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4857248201 (or 4857248196 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

Adding to 121431204775 its reverse (577402134121), we get a palindrome (698833338896).

The spelling of 121431204775 in words is "one hundred twenty-one billion, four hundred thirty-one million, two hundred four thousand, seven hundred seventy-five".