21080518782300 has 216 divisors, whose sum is σ = 69229393733136. Its totient is φ = 5563517736960.

The previous prime is 21080518782283. The next prime is 21080518782307. The reversal of 21080518782300 is 328781508012.

21080518782300 is a `hidden beast` number, since 2 + 10 + 80 + 5 + 187 + 82 + 300 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21080518782307) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2114607 + ... + 6828806.

Almost surely, 2^{21080518782300} is an apocalyptic number.

21080518782300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21080518782300 is an abundant number, since it is smaller than the sum of its proper divisors (48148874950836).

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

21080518782300 is a wasteful number, since it uses less digits than its factorization.

21080518782300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8943539 (or 8943520 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 21080518782300 in words is "twenty-one trillion, eighty billion, five hundred eighteen million, seven hundred eighty-two thousand, three hundred".