51373021 has 12 divisors (see below), whose sum is σ = 61034688. Its totient is φ = 43095192.

The previous prime is 51373013. The next prime is 51373033. The reversal of 51373021 is 12037315.

It is not a de Polignac number, because 51373021 - 2³ = 51373013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51372983 and 51373001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51373061) 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 11 ways as a sum of consecutive naturals, for example, 8851 + ... + 13456.

It is an arithmetic number, because the mean of its divisors is an integer number (5086224).

Almost surely, 2^51373021 is an apocalyptic number.

It is an amenable number.

51373021 is a deficient number, since it is larger than the sum of its proper divisors (9661667).

51373021 is a wasteful number, since it uses less digits than its factorization.

51373021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22368 (or 22361 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 51373021 is about 7167.4975409832. The cubic root of 51373021 is about 371.7449136691.

The spelling of 51373021 in words is "fifty-one million, three hundred seventy-three thousand, twenty-one".