21404144033 has 2 divisors, whose sum is σ = 21404144034. Its totient is φ = 21404144032.

The previous prime is 21404143991. The next prime is 21404144141. The reversal of 21404144033 is 33044140412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16396034209 + 5008109824 = 128047^2 + 70768^2 .

It is a cyclic number.

It is not a de Polignac number, because 21404144033 - 2¹⁰ = 21404143009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21404143993 and 21404144011.

It is not a weakly prime, because it can be changed into another prime (21404144533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10702072016 + 10702072017.

It is an arithmetic number, because the mean of its divisors is an integer number (10702072017).

Almost surely, 2^21404144033 is an apocalyptic number.

It is an amenable number.

21404144033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404144033 is an equidigital number, since it uses as much as digits as its factorization.

21404144033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21404144033 its reverse (33044140412), we get a palindrome (54448284445).

The spelling of 21404144033 in words is "twenty-one billion, four hundred four million, one hundred forty-four thousand, thirty-three".