21539150850560 has 160 divisors (see below), whose sum is σ = 60925028262912. Its totient is φ = 7146630512640.

The previous prime is 21539150850551. The next prime is 21539150850583. The reversal of 21539150850560 is 6505805193512.

It is a tau number, because it is divible by the number of its divisors (160).

It is a junction number, because it is equal to n+sod(n) for n = 21539150850499 and 21539150850508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18830957 + ... + 19941996.

Almost surely, 2^{21539150850560} is an apocalyptic number.

21539150850560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21539150850560 is an abundant number, since it is smaller than the sum of its proper divisors (39385877412352).

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

21539150850560 is an equidigital number, since it uses as much as digits as its factorization.

21539150850560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38773014 (or 38772998 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 50.

The spelling of 21539150850560 in words is "twenty-one trillion, five hundred thirty-nine billion, one hundred fifty million, eight hundred fifty thousand, five hundred sixty".