51533421 has 4 divisors (see below), whose sum is σ = 68711232. Its totient is φ = 34355612.

The previous prime is 51533389. The next prime is 51533429. The reversal of 51533421 is 12433515.

51533421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51533421 - 2⁵ = 51533389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51533391 and 51533400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51533429) 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 3 ways as a sum of consecutive naturals, for example, 8588901 + ... + 8588906.

It is an arithmetic number, because the mean of its divisors is an integer number (17177808).

Almost surely, 2^51533421 is an apocalyptic number.

It is an amenable number.

51533421 is a deficient number, since it is larger than the sum of its proper divisors (17177811).

51533421 is a wasteful number, since it uses less digits than its factorization.

51533421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17177810.

The product of its digits is 1800, while the sum is 24.

The square root of 51533421 is about 7178.6782209540. The cubic root of 51533421 is about 372.1314066341.

Adding to 51533421 its reverse (12433515), we get a palindrome (63966936).

The spelling of 51533421 in words is "fifty-one million, five hundred thirty-three thousand, four hundred twenty-one".