51421423 has 4 divisors (see below), whose sum is σ = 51930648. Its totient is φ = 50912200.

The previous prime is 51421417. The next prime is 51421427. The reversal of 51421423 is 32412415.

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

It is a cyclic number.

It is not a de Polignac number, because 51421423 - 2²⁵ = 17866991 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51421394 and 51421403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51421427) 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, 254461 + ... + 254662.

It is an arithmetic number, because the mean of its divisors is an integer number (12982662).

Almost surely, 2^51421423 is an apocalyptic number.

51421423 is a deficient number, since it is larger than the sum of its proper divisors (509225).

51421423 is a wasteful number, since it uses less digits than its factorization.

51421423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509224.

The product of its digits is 960, while the sum is 22.

The square root of 51421423 is about 7170.8732383162. The cubic root of 51421423 is about 371.8616257036.

Adding to 51421423 its reverse (32412415), we get a palindrome (83833838).

The spelling of 51421423 in words is "fifty-one million, four hundred twenty-one thousand, four hundred twenty-three".