21204110143 has 32 divisors (see below), whose sum is σ = 23537223680. Its totient is φ = 19023984000.

The previous prime is 21204110131. The next prime is 21204110167. The reversal of 21204110143 is 34101140212.

It is a cyclic number.

It is not a de Polignac number, because 21204110143 - 2⁹ = 21204109631 is a prime.

It is a super-2 number, since 2×21204110143² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21204110143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204110173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7579621 + ... + 7582417.

It is an arithmetic number, because the mean of its divisors is an integer number (735538240).

Almost surely, 2^21204110143 is an apocalyptic number.

21204110143 is a deficient number, since it is larger than the sum of its proper divisors (2333113537).

21204110143 is a wasteful number, since it uses less digits than its factorization.

21204110143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3119.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21204110143 its reverse (34101140212), we get a palindrome (55305250355).

The spelling of 21204110143 in words is "twenty-one billion, two hundred four million, one hundred ten thousand, one hundred forty-three".