51052221 has 64 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 28693440.

The previous prime is 51052219. The next prime is 51052237. The reversal of 51052221 is 12225015.

It is not a de Polignac number, because 51052221 - 2¹ = 51052219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51052194 and 51052203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51052291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 468315 + ... + 468423.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^51052221 is an apocalyptic number.

It is an amenable number.

51052221 is a deficient number, since it is larger than the sum of its proper divisors (37651779).

51052221 is a wasteful number, since it uses less digits than its factorization.

51052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51052221 is about 7145.0836944013. The cubic root of 51052221 is about 370.9695075478.

Adding to 51052221 its reverse (12225015), we get a palindrome (63277236).

The spelling of 51052221 in words is "fifty-one million, fifty-two thousand, two hundred twenty-one".