51321223 has 4 divisors (see below), whose sum is σ = 54022360. Its totient is φ = 48620088.

The previous prime is 51321203. The next prime is 51321241. The reversal of 51321223 is 32212315.

51321223 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.

It is a de Polignac number, because none of the positive numbers 2^k-51321223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 2701117 = 51321223 / (5 + 1 + 3 + 2 + 1 + 2 + 2 + 3).

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 51321223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321203) 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, 1350540 + ... + 1350577.

It is an arithmetic number, because the mean of its divisors is an integer number (13505590).

Almost surely, 2^51321223 is an apocalyptic number.

51321223 is a deficient number, since it is larger than the sum of its proper divisors (2701137).

51321223 is a wasteful number, since it uses less digits than its factorization.

51321223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2701136.

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

The square root of 51321223 is about 7163.8832346710. The cubic root of 51321223 is about 371.6199316069.

Adding to 51321223 its reverse (32212315), we get a palindrome (83533538).

It can be divided in two parts, 513 and 21223, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 51321223 in words is "fifty-one million, three hundred twenty-one thousand, two hundred twenty-three".