51021320151 has 8 divisors (see below), whose sum is σ = 68045063920. Its totient is φ = 34005894912.

The previous prime is 51021320149. The next prime is 51021320213. The reversal of 51021320151 is 15102312015.

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

It is not a de Polignac number, because 51021320151 - 2¹ = 51021320149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021320111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2065306 + ... + 2089863.

It is an arithmetic number, because the mean of its divisors is an integer number (8505632990).

Almost surely, 2^51021320151 is an apocalyptic number.

51021320151 is a deficient number, since it is larger than the sum of its proper divisors (17023743769).

51021320151 is a wasteful number, since it uses less digits than its factorization.

51021320151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4159265.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 51021320151 its reverse (15102312015), we get a palindrome (66123632166).

The spelling of 51021320151 in words is "fifty-one billion, twenty-one million, three hundred twenty thousand, one hundred fifty-one".