21074830560 has 384 divisors, whose sum is σ = 84931338240. Its totient is φ = 4781002752.

The previous prime is 21074830559. The next prime is 21074830603. The reversal of 21074830560 is 6503847012.

21074830560 is a `hidden beast` number, since 2 + 10 + 7 + 4 + 83 + 0 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4140337 + ... + 4145423.

It is an arithmetic number, because the mean of its divisors is an integer number (221175360).

Almost surely, 2^21074830560 is an apocalyptic number.

21074830560 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 21074830560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42465669120).

21074830560 is an abundant number, since it is smaller than the sum of its proper divisors (63856507680).

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

21074830560 is a wasteful number, since it uses less digits than its factorization.

21074830560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5255 (or 5241 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 21074830560 in words is "twenty-one billion, seventy-four million, eight hundred thirty thousand, five hundred sixty".