21061383360 has 224 divisors, whose sum is σ = 70250499072. Its totient is φ = 5335756800.

The previous prime is 21061383281. The next prime is 21061383391. The reversal of 21061383360 is 6338316012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3330922 + ... + 3337238.

Almost surely, 2^21061383360 is an apocalyptic number.

21061383360 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 21061383360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35125249536).

21061383360 is an abundant number, since it is smaller than the sum of its proper divisors (49189115712).

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

21061383360 is a wasteful number, since it uses less digits than its factorization.

21061383360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6511 (or 6501 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

Adding to 21061383360 its reverse (6338316012), we get a palindrome (27399699372).

The spelling of 21061383360 in words is "twenty-one billion, sixty-one million, three hundred eighty-three thousand, three hundred sixty".