21041344433 has 2 divisors, whose sum is σ = 21041344434. Its totient is φ = 21041344432.

The previous prime is 21041344427. The next prime is 21041344459. The reversal of 21041344433 is 33444314012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19211900449 + 1829443984 = 138607^2 + 42772^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041344433 - 2⁴ = 21041344417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21041344396 and 21041344405.

It is not a weakly prime, because it can be changed into another prime (21041340433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10520672216 + 10520672217.

It is an arithmetic number, because the mean of its divisors is an integer number (10520672217).

Almost surely, 2^21041344433 is an apocalyptic number.

It is an amenable number.

21041344433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21041344433 is an equidigital number, since it uses as much as digits as its factorization.

21041344433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21041344433 its reverse (33444314012), we get a palindrome (54485658445).

The spelling of 21041344433 in words is "twenty-one billion, forty-one million, three hundred forty-four thousand, four hundred thirty-three".