21000112235243 has 4 divisors (see below), whose sum is σ = 21042196629000. Its totient is φ = 20958027841488.

The previous prime is 21000112235233. The next prime is 21000112235269. The reversal of 21000112235243 is 34253221100012.

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 21000112235243 - 2⁴ = 21000112235227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000112235233) 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, 21042196130 + ... + 21042197127.

It is an arithmetic number, because the mean of its divisors is an integer number (5260549157250).

Almost surely, 2^{21000112235243} is an apocalyptic number.

21000112235243 is a deficient number, since it is larger than the sum of its proper divisors (42084393757).

21000112235243 is an equidigital number, since it uses as much as digits as its factorization.

21000112235243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42084393756.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21000112235243 its reverse (34253221100012), we get a palindrome (55253333335255).

The spelling of 21000112235243 in words is "twenty-one trillion, one hundred twelve million, two hundred thirty-five thousand, two hundred forty-three".