21818186748280 has 256 divisors, whose sum is σ = 53735804559360. Its totient is φ = 7924921804800.

The previous prime is 21818186748247. The next prime is 21818186748329. The reversal of 21818186748280 is 8284768181812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4516285465 + ... + 4516290295.

It is an arithmetic number, because the mean of its divisors is an integer number (209905486560).

Almost surely, 2^{21818186748280} is an apocalyptic number.

21818186748280 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 21818186748280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26867902279680).

21818186748280 is an abundant number, since it is smaller than the sum of its proper divisors (31917617811080).

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

21818186748280 is a wasteful number, since it uses less digits than its factorization.

21818186748280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550 (or 5546 counting only the distinct ones).

The product of its (nonzero) digits is 22020096, while the sum is 64.

The spelling of 21818186748280 in words is "twenty-one trillion, eight hundred eighteen billion, one hundred eighty-six million, seven hundred forty-eight thousand, two hundred eighty".