21443033213 has 32 divisors (see below), whose sum is σ = 25579969536. Its totient is φ = 17594817408.

The previous prime is 21443033107. The next prime is 21443033221. The reversal of 21443033213 is 31233034412.

It is not a de Polignac number, because 21443033213 - 2³⁰ = 20369291389 is a prime.

It is a super-2 number, since 2×21443033213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443033273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3578606 + ... + 3584592.

It is an arithmetic number, because the mean of its divisors is an integer number (799374048).

Almost surely, 2^21443033213 is an apocalyptic number.

It is an amenable number.

21443033213 is a deficient number, since it is larger than the sum of its proper divisors (4136936323).

21443033213 is a wasteful number, since it uses less digits than its factorization.

21443033213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6273.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21443033213 its reverse (31233034412), we get a palindrome (52676067625).

The spelling of 21443033213 in words is "twenty-one billion, four hundred forty-three million, thirty-three thousand, two hundred thirteen".