51843021 has 12 divisors (see below), whose sum is σ = 70635072. Its totient is φ = 33822328.

The previous prime is 51843017. The next prime is 51843023. The reversal of 51843021 is 12034815.

It is not a de Polignac number, because 51843021 - 2² = 51843017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51842982 and 51843000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51843023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2716 + ... + 10538.

It is an arithmetic number, because the mean of its divisors is an integer number (5886256).

Almost surely, 2^51843021 is an apocalyptic number.

It is an amenable number.

51843021 is a deficient number, since it is larger than the sum of its proper divisors (18792051).

51843021 is an equidigital number, since it uses as much as digits as its factorization.

51843021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7920 (or 7873 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 51843021 is about 7200.2097886103. The cubic root of 51843021 is about 372.8751435903.

Adding to 51843021 its reverse (12034815), we get a palindrome (63877836).

The spelling of 51843021 in words is "fifty-one million, eight hundred forty-three thousand, twenty-one".