21043243143423 has 6 divisors (see below), whose sum is σ = 30395795651624. Its totient is φ = 14028828762276.

The previous prime is 21043243143379. The next prime is 21043243143449. The reversal of 21043243143423 is 32434134234012.

21043243143423 is a `hidden beast` number, since 2 + 1 + 0 + 432 + 43 + 143 + 42 + 3 = 666.

It is not a de Polignac number, because 21043243143423 - 2³⁴ = 21026063274239 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 (21043243142423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1169069063515 + ... + 1169069063532.

Almost surely, 2^{21043243143423} is an apocalyptic number.

21043243143423 is a deficient number, since it is larger than the sum of its proper divisors (9352552508201).

21043243143423 is a wasteful number, since it uses less digits than its factorization.

21043243143423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2338138127053 (or 2338138127050 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

Adding to 21043243143423 its reverse (32434134234012), we get a palindrome (53477377377435).

The spelling of 21043243143423 in words is "twenty-one trillion, forty-three billion, two hundred forty-three million, one hundred forty-three thousand, four hundred twenty-three".