51434221 has 4 divisors (see below), whose sum is σ = 52404732. Its totient is φ = 50463712.

The previous prime is 51434209. The next prime is 51434237. The reversal of 51434221 is 12243415.

51434221 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.

It can be written as a sum of positive squares in 2 ways, for example, as 26574025 + 24860196 = 5155^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 51434221 - 2⁵ = 51434189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51434192 and 51434201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51434261) 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, 485176 + ... + 485281.

It is an arithmetic number, because the mean of its divisors is an integer number (13101183).

Almost surely, 2^51434221 is an apocalyptic number.

It is an amenable number.

51434221 is a deficient number, since it is larger than the sum of its proper divisors (970511).

51434221 is an equidigital number, since it uses as much as digits as its factorization.

51434221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970510.

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

The square root of 51434221 is about 7171.7655427377. The cubic root of 51434221 is about 371.8924733545.

Adding to 51434221 its reverse (12243415), we get a palindrome (63677636).

The spelling of 51434221 in words is "fifty-one million, four hundred thirty-four thousand, two hundred twenty-one".