21544442733 has 16 divisors (see below), whose sum is σ = 32101699392. Its totient is φ = 12738768000.

The previous prime is 21544442701. The next prime is 21544442743. The reversal of 21544442733 is 33724444512.

It is not a de Polignac number, because 21544442733 - 2⁵ = 21544442701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21544442691 and 21544442700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544442743) 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, 7960378 + ... + 7963083.

It is an arithmetic number, because the mean of its divisors is an integer number (2006356212).

Almost surely, 2^21544442733 is an apocalyptic number.

It is an amenable number.

21544442733 is a deficient number, since it is larger than the sum of its proper divisors (10557256659).

21544442733 is a wasteful number, since it uses less digits than its factorization.

21544442733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15923516.

The product of its digits is 322560, while the sum is 39.

The spelling of 21544442733 in words is "twenty-one billion, five hundred forty-four million, four hundred forty-two thousand, seven hundred thirty-three".