51271221 has 8 divisors (see below), whose sum is σ = 68406624. Its totient is φ = 34158320.

The previous prime is 51271211. The next prime is 51271223. The reversal of 51271221 is 12217215.

51271221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51271221 - 2⁵ = 51271189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51271223) 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 7 ways as a sum of consecutive naturals, for example, 715 + ... + 10151.

It is an arithmetic number, because the mean of its divisors is an integer number (8550828).

Almost surely, 2^51271221 is an apocalyptic number.

It is an amenable number.

51271221 is a deficient number, since it is larger than the sum of its proper divisors (17135403).

51271221 is a wasteful number, since it uses less digits than its factorization.

51271221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11251.

The product of its digits is 280, while the sum is 21.

The square root of 51271221 is about 7160.3925171739. The cubic root of 51271221 is about 371.4992032695.

Adding to 51271221 its reverse (12217215), we get a palindrome (63488436).

The spelling of 51271221 in words is "fifty-one million, two hundred seventy-one thousand, two hundred twenty-one".