21055503037800 has 576 divisors, whose sum is σ = 82424324505600. Its totient is φ = 4352242752000.

The previous prime is 21055503037783. The next prime is 21055503037867. The reversal of 21055503037800 is 873030555012.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 96957741 + ... + 97174659.

It is an arithmetic number, because the mean of its divisors is an integer number (143097785600).

Almost surely, 2^{21055503037800} is an apocalyptic number.

21055503037800 is a gapful number since it is divisible by the number (20) 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 21055503037800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41212162252800).

21055503037800 is an abundant number, since it is smaller than the sum of its proper divisors (61368821467800).

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

21055503037800 is a wasteful number, since it uses less digits than its factorization.

21055503037800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217158 (or 217138 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 21055503037800 in words is "twenty-one trillion, fifty-five billion, five hundred three million, thirty-seven thousand, eight hundred".