21433044321 has 24 divisors (see below), whose sum is σ = 35301488040. Its totient is φ = 12413707776.

The previous prime is 21433044319. The next prime is 21433044343. The reversal of 21433044321 is 12344033412.

21433044321 is a `hidden beast` number, since 2 + 1 + 4 + 330 + 4 + 4 + 321 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6442470225 + 14990574096 = 80265^2 + 122436^2 .

It is not a de Polignac number, because 21433044321 - 2¹ = 21433044319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21433044301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5385906 + ... + 5389883.

It is an arithmetic number, because the mean of its divisors is an integer number (1470895335).

Almost surely, 2^21433044321 is an apocalyptic number.

It is an amenable number.

21433044321 is a deficient number, since it is larger than the sum of its proper divisors (13868443719).

21433044321 is a wasteful number, since it uses less digits than its factorization.

21433044321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10775825 (or 10775822 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21433044321 its reverse (12344033412), we get a palindrome (33777077733).

The spelling of 21433044321 in words is "twenty-one billion, four hundred thirty-three million, forty-four thousand, three hundred twenty-one".