51021102000 has 480 divisors, whose sum is σ = 186720049152. Its totient is φ = 11964480000.

The previous prime is 51021101993. The next prime is 51021102007. The reversal of 51021102000 is 20112015.

It is an interprime number because it is at equal distance from previous prime (51021101993) and next prime (51021102007).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (51021102007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 22504867 + ... + 22507133.

Almost surely, 2^51021102000 is an apocalyptic number.

51021102000 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 51021102000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93360024576).

51021102000 is an abundant number, since it is smaller than the sum of its proper divisors (135698947152).

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

51021102000 is a wasteful number, since it uses less digits than its factorization.

51021102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346 (or 2319 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

Adding to 51021102000 its reverse (20112015), we get a palindrome (51041214015).

The spelling of 51021102000 in words is "fifty-one billion, twenty-one million, one hundred two thousand".