21813831699745 has 8 divisors (see below), whose sum is σ = 26189771981184. Its totient is φ = 17442282732144.

The previous prime is 21813831699743. The next prime is 21813831699787. The reversal of 21813831699745 is 54799613831812.

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

It is a cyclic number.

It is not a de Polignac number, because 21813831699745 - 2¹ = 21813831699743 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21813831699743) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1097817529 + ... + 1097837398.

It is an arithmetic number, because the mean of its divisors is an integer number (3273721497648).

Almost surely, 2^{21813831699745} is an apocalyptic number.

It is an amenable number.

21813831699745 is a deficient number, since it is larger than the sum of its proper divisors (4375940281439).

21813831699745 is a wasteful number, since it uses less digits than its factorization.

21813831699745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195656919.

The product of its digits is 78382080, while the sum is 67.

The spelling of 21813831699745 in words is "twenty-one trillion, eight hundred thirteen billion, eight hundred thirty-one million, six hundred ninety-nine thousand, seven hundred forty-five".