51426221 has 16 divisors (see below), whose sum is σ = 64555008. Its totient is φ = 39798000.

The previous prime is 51426211. The next prime is 51426239. The reversal of 51426221 is 12262415.

It is a happy number.

51426221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51426221 - 2⁶ = 51426157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51426211) 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 15 ways as a sum of consecutive naturals, for example, 9416 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (4034688).

Almost surely, 2^51426221 is an apocalyptic number.

It is an amenable number.

51426221 is a deficient number, since it is larger than the sum of its proper divisors (13128787).

51426221 is a wasteful number, since it uses less digits than its factorization.

51426221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592.

The product of its digits is 960, while the sum is 23.

The square root of 51426221 is about 7171.2077783313. The cubic root of 51426221 is about 371.8731911594.

Adding to 51426221 its reverse (12262415), we get a palindrome (63688636).

The spelling of 51426221 in words is "fifty-one million, four hundred twenty-six thousand, two hundred twenty-one".