16431024121 has 6 divisors (see below), whose sum is σ = 16887109470. Its totient is φ = 15986941056.

The previous prime is 16431024089. The next prime is 16431024133. The reversal of 16431024121 is 12142013461.

It can be written as a sum of positive squares in 3 ways, for example, as 12783468096 + 3647556025 = 113064^2 + 60395^2 .

It is not a de Polignac number, because 16431024121 - 2⁵ = 16431024089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16431024191) 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, 5999736 + ... + 6002473.

It is an arithmetic number, because the mean of its divisors is an integer number (2814518245).

Almost surely, 2^16431024121 is an apocalyptic number.

It is an amenable number.

16431024121 is a deficient number, since it is larger than the sum of its proper divisors (456085349).

16431024121 is an equidigital number, since it uses as much as digits as its factorization.

16431024121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12002283 (or 12002246 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 16431024121 its reverse (12142013461), we get a palindrome (28573037582).

The spelling of 16431024121 in words is "sixteen billion, four hundred thirty-one million, twenty-four thousand, one hundred twenty-one".