51303421 has 8 divisors (see below), whose sum is σ = 55442520. Its totient is φ = 47191872.

The previous prime is 51303383. The next prime is 51303457. The reversal of 51303421 is 12430315.

It can be written as a sum of positive squares in 4 ways, for example, as 13616100 + 37687321 = 3690^2 + 6139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51303421 - 2¹⁷ = 51172349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51303491) 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 7 ways as a sum of consecutive naturals, for example, 2926 + ... + 10543.

It is an arithmetic number, because the mean of its divisors is an integer number (6930315).

Almost surely, 2^51303421 is an apocalyptic number.

It is an amenable number.

51303421 is a deficient number, since it is larger than the sum of its proper divisors (4139099).

51303421 is a wasteful number, since it uses less digits than its factorization.

51303421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13775.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 51303421 is about 7162.6406443434. The cubic root of 51303421 is about 371.5769582020.

Adding to 51303421 its reverse (12430315), we get a palindrome (63733736).

The spelling of 51303421 in words is "fifty-one million, three hundred three thousand, four hundred twenty-one".