21056701644318 has 8 divisors (see below), whose sum is σ = 42113403288648. Its totient is φ = 7018900548104.

The previous prime is 21056701644301. The next prime is 21056701644337. The reversal of 21056701644318 is 81344610765012.

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

21056701644318 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1754725137021 + ... + 1754725137032.

It is an arithmetic number, because the mean of its divisors is an integer number (5264175411081).

Almost surely, 2^{21056701644318} is an apocalyptic number.

21056701644318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21056701644318 is a wasteful number, since it uses less digits than its factorization.

21056701644318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509450274058.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 21056701644318 in words is "twenty-one trillion, fifty-six billion, seven hundred one million, six hundred forty-four thousand, three hundred eighteen".