21530303043 has 4 divisors (see below), whose sum is σ = 28707070728. Its totient is φ = 14353535360.

The previous prime is 21530303027. The next prime is 21530303077. The reversal of 21530303043 is 34030303512.

It is a happy number.

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 21530303043 - 2⁴ = 21530303027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21530303023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3588383838 + ... + 3588383843.

It is an arithmetic number, because the mean of its divisors is an integer number (7176767682).

Almost surely, 2^21530303043 is an apocalyptic number.

21530303043 is a deficient number, since it is larger than the sum of its proper divisors (7176767685).

21530303043 is an equidigital number, since it uses as much as digits as its factorization.

21530303043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7176767684.

The product of its (nonzero) digits is 3240, while the sum is 24.

Adding to 21530303043 its reverse (34030303512), we get a palindrome (55560606555).

The spelling of 21530303043 in words is "twenty-one billion, five hundred thirty million, three hundred three thousand, forty-three".