21160513056 has 96 divisors (see below), whose sum is σ = 57575568960. Its totient is φ = 6796790784.

The previous prime is 21160513021. The next prime is 21160513067. The reversal of 21160513056 is 65031506112.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1448766 + ... + 1463298.

It is an arithmetic number, because the mean of its divisors is an integer number (599745510).

Almost surely, 2^21160513056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21160513056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28787784480).

21160513056 is an abundant number, since it is smaller than the sum of its proper divisors (36415055904).

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

21160513056 is a wasteful number, since it uses less digits than its factorization.

21160513056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15098 (or 15090 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 21160513056 in words is "twenty-one billion, one hundred sixty million, five hundred thirteen thousand, fifty-six".