21299985793781 has 8 divisors (see below), whose sum is σ = 21571729881600. Its totient is φ = 21028294806480.

The previous prime is 21299985793769. The next prime is 21299985793811. The reversal of 21299985793781 is 18739758999212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21299985793781 is a prime.

It is a super-2 number, since 2×21299985793781² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21299985793696 and 21299985793705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299985793981) 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, 12467450 + ... + 14072571.

It is an arithmetic number, because the mean of its divisors is an integer number (2696466235200).

Almost surely, 2^{21299985793781} is an apocalyptic number.

It is an amenable number.

21299985793781 is a deficient number, since it is larger than the sum of its proper divisors (271744087819).

21299985793781 is a wasteful number, since it uses less digits than its factorization.

21299985793781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26550259.

The product of its digits is 1234517760, while the sum is 80.

The spelling of 21299985793781 in words is "twenty-one trillion, two hundred ninety-nine billion, nine hundred eighty-five million, seven hundred ninety-three thousand, seven hundred eighty-one".