51704421 has 4 divisors (see below), whose sum is σ = 68939232. Its totient is φ = 34469612.

The previous prime is 51704417. The next prime is 51704431. The reversal of 51704421 is 12440715.

51704421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51704421 - 2² = 51704417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51704391 and 51704400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51704431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8617401 + ... + 8617406.

It is an arithmetic number, because the mean of its divisors is an integer number (17234808).

Almost surely, 2^51704421 is an apocalyptic number.

It is an amenable number.

51704421 is a deficient number, since it is larger than the sum of its proper divisors (17234811).

51704421 is a wasteful number, since it uses less digits than its factorization.

51704421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17234810.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 51704421 is about 7190.5786276210. The cubic root of 51704421 is about 372.5425586856.

It can be divided in two parts, 51704 and 421, that added together give a palindrome (52125).

The spelling of 51704421 in words is "fifty-one million, seven hundred four thousand, four hundred twenty-one".