51221344 has 24 divisors (see below), whose sum is σ = 101009160. Its totient is φ = 25568256.

The previous prime is 51221329. The next prime is 51221347. The reversal of 51221344 is 44312215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28867 + ... + 30589.

It is an arithmetic number, because the mean of its divisors is an integer number (4208715).

Almost surely, 2^51221344 is an apocalyptic number.

It is an amenable number.

51221344 is a deficient number, since it is larger than the sum of its proper divisors (49787816).

51221344 is a wasteful number, since it uses less digits than its factorization.

51221344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662 (or 2654 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 51221344 is about 7156.9088299349. The cubic root of 51221344 is about 371.3786985164.

Adding to 51221344 its reverse (44312215), we get a palindrome (95533559).

The spelling of 51221344 in words is "fifty-one million, two hundred twenty-one thousand, three hundred forty-four".