51021040000 has 320 divisors, whose sum is σ = 149892019200. Its totient is φ = 16922880000.

The previous prime is 51021039983. The next prime is 51021040013. The reversal of 51021040000 is 4012015.

It is a tau number, because it is divible by the number of its divisors (320).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 17358531 + ... + 17361469.

It is an arithmetic number, because the mean of its divisors is an integer number (468412560).

Almost surely, 2^51021040000 is an apocalyptic number.

51021040000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51021040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74946009600).

51021040000 is an abundant number, since it is smaller than the sum of its proper divisors (98870979200).

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

51021040000 is an equidigital number, since it uses as much as digits as its factorization.

51021040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011 (or 2984 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

Adding to 51021040000 its reverse (4012015), we get a palindrome (51025052015).

The spelling of 51021040000 in words is "fifty-one billion, twenty-one million, forty thousand".