51403421 has 4 divisors (see below), whose sum is σ = 51424032. Its totient is φ = 51382812.

The previous prime is 51403411. The next prime is 51403433. The reversal of 51403421 is 12430415.

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 a de Polignac number, because none of the positive numbers 2^k-51403421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51403393 and 51403402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51403411) 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, 5951 + ... + 11756.

It is an arithmetic number, because the mean of its divisors is an integer number (12856008).

Almost surely, 2^51403421 is an apocalyptic number.

It is an amenable number.

51403421 is a deficient number, since it is larger than the sum of its proper divisors (20611).

51403421 is a wasteful number, since it uses less digits than its factorization.

51403421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20610.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 51403421 is about 7169.6179117161. The cubic root of 51403421 is about 371.8182259301.

Adding to 51403421 its reverse (12430415), we get a palindrome (63833836).

The spelling of 51403421 in words is "fifty-one million, four hundred three thousand, four hundred twenty-one".