21093057480 has 256 divisors, whose sum is σ = 72924364800. Its totient is φ = 4827064320.

The previous prime is 21093057439. The next prime is 21093057481. The reversal of 21093057480 is 8475039012.

It is not an unprimeable number, because it can be changed into a prime (21093057481) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 7848697 + ... + 7851383.

It is an arithmetic number, because the mean of its divisors is an integer number (284860800).

Almost surely, 2^21093057480 is an apocalyptic number.

21093057480 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 21093057480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36462182400).

21093057480 is an abundant number, since it is smaller than the sum of its proper divisors (51831307320).

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

21093057480 is a wasteful number, since it uses less digits than its factorization.

21093057480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044 (or 3040 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 21093057480 in words is "twenty-one billion, ninety-three million, fifty-seven thousand, four hundred eighty".