51425421 has 4 divisors (see below), whose sum is σ = 68567232. Its totient is φ = 34283612.

The previous prime is 51425417. The next prime is 51425431. The reversal of 51425421 is 12452415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51425421 - 2² = 51425417 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51425391 and 51425400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51425431) 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, 8570901 + ... + 8570906.

It is an arithmetic number, because the mean of its divisors is an integer number (17141808).

Almost surely, 2^51425421 is an apocalyptic number.

It is an amenable number.

51425421 is a deficient number, since it is larger than the sum of its proper divisors (17141811).

51425421 is a wasteful number, since it uses less digits than its factorization.

51425421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17141810.

The product of its digits is 1600, while the sum is 24.

The square root of 51425421 is about 7171.1519995047. The cubic root of 51425421 is about 371.8712628299.

Adding to 51425421 its reverse (12452415), we get a palindrome (63877836).

The spelling of 51425421 in words is "fifty-one million, four hundred twenty-five thousand, four hundred twenty-one".