21256432024443 has 128 divisors (see below), whose sum is σ = 37504854835200. Its totient is φ = 10367528448000.

The previous prime is 21256432024391. The next prime is 21256432024447. The reversal of 21256432024443 is 34442023465212.

It is not a de Polignac number, because 21256432024443 - 2⁸ = 21256432024187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21256432024395 and 21256432024404.

It is not an unprimeable number, because it can be changed into a prime (21256432024447) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3081085408 + ... + 3081092306.

It is an arithmetic number, because the mean of its divisors is an integer number (293006678400).

Almost surely, 2^{21256432024443} is an apocalyptic number.

21256432024443 is a deficient number, since it is larger than the sum of its proper divisors (16248422810757).

21256432024443 is a wasteful number, since it uses less digits than its factorization.

21256432024443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8729.

The product of its (nonzero) digits is 1105920, while the sum is 42.

Adding to 21256432024443 its reverse (34442023465212), we get a palindrome (55698455489655).

The spelling of 21256432024443 in words is "twenty-one trillion, two hundred fifty-six billion, four hundred thirty-two million, twenty-four thousand, four hundred forty-three".