21302985346680 has 64 divisors (see below), whose sum is σ = 63909311817600. Its totient is φ = 5680764467840.

The previous prime is 21302985346673. The next prime is 21302985346733. The reversal of 21302985346680 is 8664358920312.

It is a self number, because there is not a number n which added to its sum of digits gives 21302985346680.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27941335 + ... + 28693625.

It is an arithmetic number, because the mean of its divisors is an integer number (998582997150).

Almost surely, 2^{21302985346680} is an apocalyptic number.

21302985346680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21302985346680 is an abundant number, since it is smaller than the sum of its proper divisors (42606326470920).

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

21302985346680 is a wasteful number, since it uses less digits than its factorization.

21302985346680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988284 (or 988280 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 57.

The spelling of 21302985346680 in words is "twenty-one trillion, three hundred two billion, nine hundred eighty-five million, three hundred forty-six thousand, six hundred eighty".