51230221 has 8 divisors (see below), whose sum is σ = 58593920. Its totient is φ = 43877808.

The previous prime is 51230219. The next prime is 51230261. The reversal of 51230221 is 12203215.

51230221 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 51230221 - 2¹ = 51230219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51230195 and 51230204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51230261) 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, 12400 + ... + 16006.

It is an arithmetic number, because the mean of its divisors is an integer number (7324240).

Almost surely, 2^51230221 is an apocalyptic number.

It is an amenable number.

51230221 is a deficient number, since it is larger than the sum of its proper divisors (7363699).

51230221 is a wasteful number, since it uses less digits than its factorization.

51230221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51230221 is about 7157.5289730465. The cubic root of 51230221 is about 371.4001514110.

Adding to 51230221 its reverse (12203215), we get a palindrome (63433436).

The spelling of 51230221 in words is "fifty-one million, two hundred thirty thousand, two hundred twenty-one".