51020200000 has 336 divisors, whose sum is σ = 157819148928. Its totient is φ = 15897600000.

The previous prime is 51020199983. The next prime is 51020200013. The reversal of 51020200000 is 202015.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 51020200000.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15398344 + ... + 15401656.

It is an arithmetic number, because the mean of its divisors is an integer number (469699848).

Almost surely, 2^51020200000 is an apocalyptic number.

51020200000 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 51020200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78909574464).

51020200000 is an abundant number, since it is smaller than the sum of its proper divisors (106798948928).

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

51020200000 is an equidigital number, since it uses as much as digits as its factorization.

51020200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368 (or 3338 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

Adding to 51020200000 its reverse (202015), we get a palindrome (51020402015).

The spelling of 51020200000 in words is "fifty-one billion, twenty million, two hundred thousand".