21500003054443 has 4 divisors (see below), whose sum is σ = 21500545106440. Its totient is φ = 21499461002448.

The previous prime is 21500003054423. The next prime is 21500003054449. The reversal of 21500003054443 is 34445030000512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21500003054443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500003054449) 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, 270966498 + ... + 271045831.

It is an arithmetic number, because the mean of its divisors is an integer number (5375136276610).

Almost surely, 2^{21500003054443} is an apocalyptic number.

21500003054443 is a deficient number, since it is larger than the sum of its proper divisors (542051997).

21500003054443 is an equidigital number, since it uses as much as digits as its factorization.

21500003054443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542051996.

The product of its (nonzero) digits is 28800, while the sum is 31.

Adding to 21500003054443 its reverse (34445030000512), we get a palindrome (55945033054955).

The spelling of 21500003054443 in words is "twenty-one trillion, five hundred billion, three million, fifty-four thousand, four hundred forty-three".