21042655063823 has 8 divisors (see below), whose sum is σ = 21138855690240. Its totient is φ = 20946522404920.

The previous prime is 21042655063763. The next prime is 21042655063861. The reversal of 21042655063823 is 32836055624012.

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 21042655063823 - 2¹⁰ = 21042655062799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042655063873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16371215 + ... + 17609712.

It is an arithmetic number, because the mean of its divisors is an integer number (2642356961280).

Almost surely, 2^{21042655063823} is an apocalyptic number.

21042655063823 is a deficient number, since it is larger than the sum of its proper divisors (96200626417).

21042655063823 is a wasteful number, since it uses less digits than its factorization.

21042655063823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33983757.

The product of its (nonzero) digits is 2073600, while the sum is 47.

The spelling of 21042655063823 in words is "twenty-one trillion, forty-two billion, six hundred fifty-five million, sixty-three thousand, eight hundred twenty-three".