21303202985 has 8 divisors (see below), whose sum is σ = 25802758656. Its totient is φ = 16883285680.

The previous prime is 21303202957. The next prime is 21303202993. The reversal of 21303202985 is 58920230312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21303202985 is a prime.

It is a super-2 number, since 2×21303202985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19909001 + ... + 19910070.

It is an arithmetic number, because the mean of its divisors is an integer number (3225344832).

Almost surely, 2^21303202985 is an apocalyptic number.

It is an amenable number.

21303202985 is a deficient number, since it is larger than the sum of its proper divisors (4499555671).

21303202985 is a wasteful number, since it uses less digits than its factorization.

21303202985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39819183.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21303202985 in words is "twenty-one billion, three hundred three million, two hundred two thousand, nine hundred eighty-five".