51430432121 has 4 divisors (see below), whose sum is σ = 51430898532. Its totient is φ = 51429965712.

The previous prime is 51430432019. The next prime is 51430432159. The reversal of 51430432121 is 12123403415.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12123403415 = 5 ⋅2424680683.

It can be written as a sum of positive squares in 2 ways, for example, as 42240525625 + 9189906496 = 205525^2 + 95864^2 .

It is a cyclic number.

It is not a de Polignac number, because 51430432121 - 2³⁴ = 34250562937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51430432621) 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, 35075 + ... + 322631.

It is an arithmetic number, because the mean of its divisors is an integer number (12857724633).

Almost surely, 2^51430432121 is an apocalyptic number.

It is an amenable number.

51430432121 is a deficient number, since it is larger than the sum of its proper divisors (466411).

51430432121 is a wasteful number, since it uses less digits than its factorization.

51430432121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466410.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 51430432121 its reverse (12123403415), we get a palindrome (63553835536).

The spelling of 51430432121 in words is "fifty-one billion, four hundred thirty million, four hundred thirty-two thousand, one hundred twenty-one".