51023421 has 12 divisors (see below), whose sum is σ = 73876348. Its totient is φ = 33934464.

The previous prime is 51023363. The next prime is 51023429. The reversal of 51023421 is 12432015.

51023421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 26163225 + 24860196 = 5115^2 + 4986^2 .

It is not a de Polignac number, because 51023421 - 2⁷ = 51023293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51023394 and 51023403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51023429) 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 11 ways as a sum of consecutive naturals, for example, 2650 + ... + 10443.

Almost surely, 2^51023421 is an apocalyptic number.

It is an amenable number.

51023421 is a deficient number, since it is larger than the sum of its proper divisors (22852927).

51023421 is a wasteful number, since it uses less digits than its factorization.

51023421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13532 (or 13529 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51023421 is about 7143.0680383152. The cubic root of 51023421 is about 370.8997363001.

Adding to 51023421 its reverse (12432015), we get a palindrome (63455436).

The spelling of 51023421 in words is "fifty-one million, twenty-three thousand, four hundred twenty-one".