21423424243 has 8 divisors (see below), whose sum is σ = 23866945200. Its totient is φ = 19093555488.

The previous prime is 21423424201. The next prime is 21423424247. The reversal of 21423424243 is 34242432412.

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 21423424243 - 2³³ = 12833489651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21423424247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28412653 + ... + 28413406.

It is an arithmetic number, because the mean of its divisors is an integer number (2983368150).

Almost surely, 2^21423424243 is an apocalyptic number.

21423424243 is a deficient number, since it is larger than the sum of its proper divisors (2443520957).

21423424243 is a wasteful number, since it uses less digits than its factorization.

21423424243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56826101.

The product of its digits is 36864, while the sum is 31.

Adding to 21423424243 its reverse (34242432412), we get a palindrome (55665856655).

The spelling of 21423424243 in words is "twenty-one billion, four hundred twenty-three million, four hundred twenty-four thousand, two hundred forty-three".