21130522344443 has 4 divisors (see below), whose sum is σ = 21131017142880. Its totient is φ = 21130027546008.

The previous prime is 21130522344401. The next prime is 21130522344461. The reversal of 21130522344443 is 34444322503112.

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 21130522344443 - 2¹⁰ = 21130522343419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21130522344397 and 21130522344406.

It is not an unprimeable number, because it can be changed into a prime (21130522341443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247335155 + ... + 247420572.

It is an arithmetic number, because the mean of its divisors is an integer number (5282754285720).

Almost surely, 2^{21130522344443} is an apocalyptic number.

21130522344443 is a deficient number, since it is larger than the sum of its proper divisors (494798437).

21130522344443 is an equidigital number, since it uses as much as digits as its factorization.

21130522344443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494798436.

The product of its (nonzero) digits is 276480, while the sum is 38.

Adding to 21130522344443 its reverse (34444322503112), we get a palindrome (55574844847555).

The spelling of 21130522344443 in words is "twenty-one trillion, one hundred thirty billion, five hundred twenty-two million, three hundred forty-four thousand, four hundred forty-three".