51414221 has 4 divisors (see below), whose sum is σ = 51431100. Its totient is φ = 51397344.

The previous prime is 51414199. The next prime is 51414229. The reversal of 51414221 is 12241415.

It is a happy number.

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 29041321 + 22372900 = 5389^2 + 4730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51414221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51414193 and 51414202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51414229) 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, 2456 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (12857775).

Almost surely, 2^51414221 is an apocalyptic number.

It is an amenable number.

51414221 is a deficient number, since it is larger than the sum of its proper divisors (16879).

51414221 is a wasteful number, since it uses less digits than its factorization.

51414221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16878.

The product of its digits is 320, while the sum is 20.

The square root of 51414221 is about 7170.3710503711. The cubic root of 51414221 is about 371.8442641170.

Adding to 51414221 its reverse (12241415), we get a palindrome (63655636).

The spelling of 51414221 in words is "fifty-one million, four hundred fourteen thousand, two hundred twenty-one".