21210363543 has 8 divisors (see below), whose sum is σ = 28281215088. Its totient is φ = 14139877184.

The previous prime is 21210363541. The next prime is 21210363571. The reversal of 21210363543 is 34536301212.

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 21210363543 - 2¹ = 21210363541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21210363543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210363541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103771 + ... + 230627.

It is an arithmetic number, because the mean of its divisors is an integer number (3535151886).

Almost surely, 2^21210363543 is an apocalyptic number.

21210363543 is a deficient number, since it is larger than the sum of its proper divisors (7070851545).

21210363543 is a wasteful number, since it uses less digits than its factorization.

21210363543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182593.

The product of its (nonzero) digits is 12960, while the sum is 30.

Adding to 21210363543 its reverse (34536301212), we get a palindrome (55746664755).

The spelling of 21210363543 in words is "twenty-one billion, two hundred ten million, three hundred sixty-three thousand, five hundred forty-three".