21404334033 has 12 divisors (see below), whose sum is σ = 31201018420. Its totient is φ = 14138642016.

The previous prime is 21404334031. The next prime is 21404334047. The reversal of 21404334033 is 33043340412.

21404334033 is a `hidden beast` number, since 214 + 0 + 43 + 3 + 403 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15920635329 + 5483698704 = 126177^2 + 74052^2 .

It is not a de Polignac number, because 21404334033 - 2¹ = 21404334031 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21404333988 and 21404334006.

It is not an unprimeable number, because it can be changed into a prime (21404334031) 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, 10908466 + ... + 10910427.

Almost surely, 2^21404334033 is an apocalyptic number.

It is an amenable number.

21404334033 is a deficient number, since it is larger than the sum of its proper divisors (9796684387).

21404334033 is a wasteful number, since it uses less digits than its factorization.

21404334033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21819008 (or 21819005 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21404334033 its reverse (33043340412), we get a palindrome (54447674445).

The spelling of 21404334033 in words is "twenty-one billion, four hundred four million, three hundred thirty-four thousand, thirty-three".