21120243102143 has 32 divisors (see below), whose sum is σ = 21949494974400. Its totient is φ = 20305450137600.

The previous prime is 21120243102121. The next prime is 21120243102209. The reversal of 21120243102143 is 34120134202112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21120243102143 - 2²⁰ = 21120242053567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120243102043) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5568214055 + ... + 5568217847.

It is an arithmetic number, because the mean of its divisors is an integer number (685921717950).

Almost surely, 2^{21120243102143} is an apocalyptic number.

21120243102143 is a deficient number, since it is larger than the sum of its proper divisors (829251872257).

21120243102143 is a wasteful number, since it uses less digits than its factorization.

21120243102143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6507.

The product of its (nonzero) digits is 2304, while the sum is 26.

Adding to 21120243102143 its reverse (34120134202112), we get a palindrome (55240377304255).

The spelling of 21120243102143 in words is "twenty-one trillion, one hundred twenty billion, two hundred forty-three million, one hundred two thousand, one hundred forty-three".