21431045443 has 16 divisors (see below), whose sum is σ = 22264200000. Its totient is φ = 20604350592.

The previous prime is 21431045431. The next prime is 21431045473. The reversal of 21431045443 is 34454013412.

It is not a de Polignac number, because 21431045443 - 2⁹ = 21431044931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431045413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13834633 + ... + 13836181.

It is an arithmetic number, because the mean of its divisors is an integer number (1391512500).

Almost surely, 2^21431045443 is an apocalyptic number.

21431045443 is a deficient number, since it is larger than the sum of its proper divisors (833154557).

21431045443 is a wasteful number, since it uses less digits than its factorization.

21431045443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3294.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 21431045443 its reverse (34454013412), we get a palindrome (55885058855).

The spelling of 21431045443 in words is "twenty-one billion, four hundred thirty-one million, forty-five thousand, four hundred forty-three".