21062393856 has 336 divisors, whose sum is σ = 71479160064. Its totient is φ = 5849874432.

The previous prime is 21062393827. The next prime is 21062393887. The reversal of 21062393856 is 65839326012.

21062393856 is a `hidden beast` number, since 2 + 10 + 623 + 9 + 3 + 8 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

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 23 ways as a sum of consecutive naturals, for example, 19095001 + ... + 19096103.

Almost surely, 2^21062393856 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 21062393856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35739580032).

21062393856 is an abundant number, since it is smaller than the sum of its proper divisors (50416766208).

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

21062393856 is a wasteful number, since it uses less digits than its factorization.

21062393856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 21062393856 in words is "twenty-one billion, sixty-two million, three hundred ninety-three thousand, eight hundred fifty-six".