51421018 has 8 divisors (see below), whose sum is σ = 84143520. Its totient is φ = 23373180.

The previous prime is 51421001. The next prime is 51421043. The reversal of 51421018 is 81012415.

51421018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (22), and also a Moran number because the ratio is a prime number: 2337319 = 51421018 / (5 + 1 + 4 + 2 + 1 + 0 + 1 + 8).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 51421018.

It is an unprimeable number.

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, 1168638 + ... + 1168681.

It is an arithmetic number, because the mean of its divisors is an integer number (10517940).

Almost surely, 2^51421018 is an apocalyptic number.

51421018 is a deficient number, since it is larger than the sum of its proper divisors (32722502).

51421018 is a wasteful number, since it uses less digits than its factorization.

51421018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337332.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 51421018 is about 7170.8449990221. The cubic root of 51421018 is about 371.8606494286.

The spelling of 51421018 in words is "fifty-one million, four hundred twenty-one thousand, eighteen".