21443134533 has 12 divisors (see below), whose sum is σ = 28817808480. Its totient is φ = 14182828632.

The previous prime is 21443134519. The next prime is 21443134541. The reversal of 21443134533 is 33543134412.

It is a de Polignac number, because none of the positive numbers 2^k-21443134533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21443134494 and 21443134503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443134333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173193 + ... + 269966.

It is an arithmetic number, because the mean of its divisors is an integer number (2401484040).

Almost surely, 2^21443134533 is an apocalyptic number.

It is an amenable number.

21443134533 is a deficient number, since it is larger than the sum of its proper divisors (7374673947).

21443134533 is an equidigital number, since it uses as much as digits as its factorization.

21443134533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443416 (or 443289 counting only the distinct ones).

The product of its digits is 51840, while the sum is 33.

Adding to 21443134533 its reverse (33543134412), we get a palindrome (54986268945).

The spelling of 21443134533 in words is "twenty-one billion, four hundred forty-three million, one hundred thirty-four thousand, five hundred thirty-three".