21242144043 has 12 divisors (see below), whose sum is σ = 31672874688. Its totient is φ = 13704608880.

The previous prime is 21242144041. The next prime is 21242144047. The reversal of 21242144043 is 34044124212.

21242144043 is a `hidden beast` number, since 2 + 1 + 242 + 14 + 404 + 3 = 666.

It is not a de Polignac number, because 21242144043 - 2¹ = 21242144041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21242143998 and 21242144016.

It is not an unprimeable number, because it can be changed into a prime (21242144041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38068080 + ... + 38068637.

It is an arithmetic number, because the mean of its divisors is an integer number (2639406224).

Almost surely, 2^21242144043 is an apocalyptic number.

21242144043 is a deficient number, since it is larger than the sum of its proper divisors (10430730645).

21242144043 is a wasteful number, since it uses less digits than its factorization.

21242144043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76136754 (or 76136751 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21242144043 its reverse (34044124212), we get a palindrome (55286268255).

The spelling of 21242144043 in words is "twenty-one billion, two hundred forty-two million, one hundred forty-four thousand, forty-three".