21115055205300 has 288 divisors, whose sum is σ = 73935960295680. Its totient is φ = 4541880729600.

The previous prime is 21115055205281. The next prime is 21115055205313. The reversal of 21115055205300 is 350255051112.

It is a super-4 number, since 4×21115055205300⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 370144780 + ... + 370201820.

It is an arithmetic number, because the mean of its divisors is an integer number (256722084360).

Almost surely, 2^{21115055205300} is an apocalyptic number.

21115055205300 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 21115055205300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36967980147840).

21115055205300 is an abundant number, since it is smaller than the sum of its proper divisors (52820905090380).

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

21115055205300 is a wasteful number, since it uses less digits than its factorization.

21115055205300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67451 (or 67444 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The spelling of 21115055205300 in words is "twenty-one trillion, one hundred fifteen billion, fifty-five million, two hundred five thousand, three hundred".