51021013 has 8 divisors (see below), whose sum is σ = 51912000. Its totient is φ = 50136768.

The previous prime is 51021011. The next prime is 51021037. The reversal of 51021013 is 31012015.

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

It is a cyclic number.

It is not a de Polignac number, because 51021013 - 2¹ = 51021011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51020984 and 51021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14973 + ... + 18061.

It is an arithmetic number, because the mean of its divisors is an integer number (6489000).

Almost surely, 2^51021013 is an apocalyptic number.

It is an amenable number.

51021013 is a deficient number, since it is larger than the sum of its proper divisors (890987).

51021013 is a wasteful number, since it uses less digits than its factorization.

51021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 51021013 is about 7142.8994813031. The cubic root of 51021013 is about 370.8939014593.

Adding to 51021013 its reverse (31012015), we get a palindrome (82033028).

The spelling of 51021013 in words is "fifty-one million, twenty-one thousand, thirteen".