21242403043 has 8 divisors (see below), whose sum is σ = 22167772416. Its totient is φ = 20317182600.

The previous prime is 21242403019. The next prime is 21242403071. The reversal of 21242403043 is 34030424212.

It is a happy number.

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 21242403043 - 2¹³ = 21242394851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21242402999 and 21242403017.

It is not an unprimeable number, because it can be changed into a prime (21242403073) 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 7 ways as a sum of consecutive naturals, for example, 332458 + ... + 391168.

It is an arithmetic number, because the mean of its divisors is an integer number (2770971552).

Almost surely, 2^21242403043 is an apocalyptic number.

21242403043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21242403043 is a deficient number, since it is larger than the sum of its proper divisors (925369373).

21242403043 is a wasteful number, since it uses less digits than its factorization.

21242403043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74465.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21242403043 its reverse (34030424212), we get a palindrome (55272827255).

The spelling of 21242403043 in words is "twenty-one billion, two hundred forty-two million, four hundred three thousand, forty-three".