21186847080 has 256 divisors, whose sum is σ = 83316326400. Its totient is φ = 4686439680.

The previous prime is 21186847069. The next prime is 21186847139. The reversal of 21186847080 is 8074868112.

21186847080 is a `hidden beast` number, since 2 + 118 + 68 + 470 + 8 + 0 = 666.

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

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, 189159 + ... + 279561.

It is an arithmetic number, because the mean of its divisors is an integer number (325454400).

Almost surely, 2^21186847080 is an apocalyptic number.

21186847080 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 21186847080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41658163200).

21186847080 is an abundant number, since it is smaller than the sum of its proper divisors (62129479320).

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

21186847080 is a wasteful number, since it uses less digits than its factorization.

21186847080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90461 (or 90451 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 45.

It can be divided in two parts, 2118684 and 7080, that added together give a square (2125764 = 1458²).

The spelling of 21186847080 in words is "twenty-one billion, one hundred eighty-six million, eight hundred forty-seven thousand, eighty".