51000430521 has 16 divisors (see below), whose sum is σ = 69469691904. Its totient is φ = 33266192784.

The previous prime is 51000430471. The next prime is 51000430541. The reversal of 51000430521 is 12503400015.

It is not a de Polignac number, because 51000430521 - 2¹⁰ = 51000429497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51000430541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395160 + ... + 508086.

It is an arithmetic number, because the mean of its divisors is an integer number (4341855744).

Almost surely, 2^51000430521 is an apocalyptic number.

It is an amenable number.

51000430521 is a deficient number, since it is larger than the sum of its proper divisors (18469261383).

51000430521 is a wasteful number, since it uses less digits than its factorization.

51000430521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116180.

The product of its (nonzero) digits is 600, while the sum is 21.

Adding to 51000430521 its reverse (12503400015), we get a palindrome (63503830536).

The spelling of 51000430521 in words is "fifty-one billion, four hundred thirty thousand, five hundred twenty-one".