21442023394243 has 4 divisors (see below), whose sum is σ = 22703318888040. Its totient is φ = 20180727900448.

The previous prime is 21442023394241. The next prime is 21442023394357. The reversal of 21442023394243 is 34249332024412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21442023394243 - 2¹ = 21442023394241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21442023394243.

It is not an unprimeable number, because it can be changed into a prime (21442023394241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630647746873 + ... + 630647746906.

It is an arithmetic number, because the mean of its divisors is an integer number (5675829722010).

Almost surely, 2^{21442023394243} is an apocalyptic number.

21442023394243 is a deficient number, since it is larger than the sum of its proper divisors (1261295493797).

21442023394243 is a wasteful number, since it uses less digits than its factorization.

21442023394243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261295493796.

The product of its (nonzero) digits is 995328, while the sum is 43.

The spelling of 21442023394243 in words is "twenty-one trillion, four hundred forty-two billion, twenty-three million, three hundred ninety-four thousand, two hundred forty-three".