3215821213568 has 16 divisors (see below), whose sum is σ = 6406518824160. Its totient is φ = 1607910606720.

The previous prime is 3215821213537. The next prime is 3215821213571. The reversal of 3215821213568 is 8653121285123.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12561801488 + ... + 12561801743.

It is an arithmetic number, because the mean of its divisors is an integer number (400407426510).

Almost surely, 2^{3215821213568} is an apocalyptic number.

It is an amenable number.

3215821213568 is a deficient number, since it is larger than the sum of its proper divisors (3190697610592).

3215821213568 is an equidigital number, since it uses as much as digits as its factorization.

3215821213568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25123603245 (or 25123603233 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The spelling of 3215821213568 in words is "three trillion, two hundred fifteen billion, eight hundred twenty-one million, two hundred thirteen thousand, five hundred sixty-eight".