51321242 has 32 divisors (see below), whose sum is σ = 95817600. Its totient is φ = 20115648.

The previous prime is 51321241. The next prime is 51321247. The reversal of 51321242 is 24212315.

51321242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51321241) 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, 4388 + ... + 11040.

It is an arithmetic number, because the mean of its divisors is an integer number (2994300).

Almost surely, 2^51321242 is an apocalyptic number.

51321242 is a deficient number, since it is larger than the sum of its proper divisors (44496358).

51321242 is a wasteful number, since it uses less digits than its factorization.

51321242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6710.

The product of its digits is 480, while the sum is 20.

The square root of 51321242 is about 7163.8845607673. The cubic root of 51321242 is about 371.6199774670.

Adding to 51321242 its reverse (24212315), we get a palindrome (75533557).

The spelling of 51321242 in words is "fifty-one million, three hundred twenty-one thousand, two hundred forty-two".