51230500421 has 4 divisors (see below), whose sum is σ = 51932288172. Its totient is φ = 50528712672.

The previous prime is 51230500381. The next prime is 51230500463. The reversal of 51230500421 is 12400503215.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21010502500 + 30219997921 = 144950^2 + 173839^2 .

It is a cyclic number.

It is not a de Polignac number, because 51230500421 - 2¹⁴ = 51230484037 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 (51230500471) 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, 350893766 + ... + 350893911.

It is an arithmetic number, because the mean of its divisors is an integer number (12983072043).

Almost surely, 2^51230500421 is an apocalyptic number.

It is an amenable number.

51230500421 is a deficient number, since it is larger than the sum of its proper divisors (701787751).

51230500421 is an equidigital number, since it uses as much as digits as its factorization.

51230500421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701787750.

The product of its (nonzero) digits is 1200, while the sum is 23.

The spelling of 51230500421 in words is "fifty-one billion, two hundred thirty million, five hundred thousand, four hundred twenty-one".