51059821500 has 384 divisors, whose sum is σ = 175127097600. Its totient is φ = 12821760000.

The previous prime is 51059821489. The next prime is 51059821511. The reversal of 51059821500 is 512895015.

It is a happy number.

51059821500 is a `hidden beast` number, since 5 + 10 + 598 + 2 + 1 + 50 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51059821489) and next prime (51059821511).

It is a super-2 number, since 2×51059821500² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 16049910 + ... + 16053090.

It is an arithmetic number, because the mean of its divisors is an integer number (456060150).

Almost surely, 2^51059821500 is an apocalyptic number.

51059821500 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 51059821500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87563548800).

51059821500 is an abundant number, since it is smaller than the sum of its proper divisors (124067276100).

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

51059821500 is a wasteful number, since it uses less digits than its factorization.

51059821500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3279 (or 3261 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The spelling of 51059821500 in words is "fifty-one billion, fifty-nine million, eight hundred twenty-one thousand, five hundred".