21116143985 has 8 divisors (see below), whose sum is σ = 26156772096. Its totient is φ = 16347982320.

The previous prime is 21116143957. The next prime is 21116144011. The reversal of 21116143985 is 58934161112.

It is a happy number.

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

It is not a de Polignac number, because 21116143985 - 2⁸ = 21116143729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68116439 + ... + 68116748.

It is an arithmetic number, because the mean of its divisors is an integer number (3269596512).

Almost surely, 2^21116143985 is an apocalyptic number.

It is an amenable number.

21116143985 is a deficient number, since it is larger than the sum of its proper divisors (5040628111).

21116143985 is a wasteful number, since it uses less digits than its factorization.

21116143985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136233223.

The product of its digits is 51840, while the sum is 41.

The spelling of 21116143985 in words is "twenty-one billion, one hundred sixteen million, one hundred forty-three thousand, nine hundred eighty-five".