51354434321 has 4 divisors (see below), whose sum is σ = 51482500644. Its totient is φ = 51226368000.

The previous prime is 51354434311. The next prime is 51354434357. The reversal of 51354434321 is 12343445315.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12343445315 = 5 ⋅2468689063.

It can be written as a sum of positive squares in 2 ways, for example, as 40214687296 + 11139747025 = 200536^2 + 105545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51354434321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51354434311) 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, 64032560 + ... + 64033361.

It is an arithmetic number, because the mean of its divisors is an integer number (12870625161).

Almost surely, 2^51354434321 is an apocalyptic number.

It is an amenable number.

51354434321 is a deficient number, since it is larger than the sum of its proper divisors (128066323).

51354434321 is a wasteful number, since it uses less digits than its factorization.

51354434321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128066322.

The product of its digits is 86400, while the sum is 35.

Adding to 51354434321 its reverse (12343445315), we get a palindrome (63697879636).

The spelling of 51354434321 in words is "fifty-one billion, three hundred fifty-four million, four hundred thirty-four thousand, three hundred twenty-one".