21660801351814 has 16 divisors (see below), whose sum is σ = 33905547093600. Its totient is φ = 10358999101440.

The previous prime is 21660801351751. The next prime is 21660801351823. The reversal of 21660801351814 is 41815310806612.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10758267 + ... + 12611974.

It is an arithmetic number, because the mean of its divisors is an integer number (2119096693350).

Almost surely, 2^{21660801351814} is an apocalyptic number.

21660801351814 is a deficient number, since it is larger than the sum of its proper divisors (12244745741786).

21660801351814 is a wasteful number, since it uses less digits than its factorization.

21660801351814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23390415.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 21660801351814 in words is "twenty-one trillion, six hundred sixty billion, eight hundred one million, three hundred fifty-one thousand, eight hundred fourteen".