51021255351 has 32 divisors (see below), whose sum is σ = 78167404800. Its totient is φ = 29276225280.

The previous prime is 51021255347. The next prime is 51021255353. The reversal of 51021255351 is 15355212015.

It is not a de Polignac number, because 51021255351 - 2² = 51021255347 is a prime.

It is a super-2 number, since 2×51021255351² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021255353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1014385 + ... + 1063493.

It is an arithmetic number, because the mean of its divisors is an integer number (2442731400).

Almost surely, 2^51021255351 is an apocalyptic number.

51021255351 is a deficient number, since it is larger than the sum of its proper divisors (27146149449).

51021255351 is a wasteful number, since it uses less digits than its factorization.

51021255351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50799.

The product of its (nonzero) digits is 7500, while the sum is 30.

Adding to 51021255351 its reverse (15355212015), we get a palindrome (66376467366).

The spelling of 51021255351 in words is "fifty-one billion, twenty-one million, two hundred fifty-five thousand, three hundred fifty-one".