51021420006 has 32 divisors (see below), whose sum is σ = 103991348448. Its totient is φ = 16682531840.

The previous prime is 51021420001. The next prime is 51021420041. The reversal of 51021420006 is 60002412015.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51021420001) 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 15 ways as a sum of consecutive naturals, for example, 1657750 + ... + 1688246.

It is an arithmetic number, because the mean of its divisors is an integer number (3249729639).

Almost surely, 2^51021420006 is an apocalyptic number.

51021420006 is an abundant number, since it is smaller than the sum of its proper divisors (52969928442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51021420006 is a wasteful number, since it uses less digits than its factorization.

51021420006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35816.

The product of its (nonzero) digits is 480, while the sum is 21.

The spelling of 51021420006 in words is "fifty-one billion, twenty-one million, four hundred twenty thousand, six".