21243234142033 has 2 divisors, whose sum is σ = 21243234142034. Its totient is φ = 21243234142032.

The previous prime is 21243234141991. The next prime is 21243234142087. The reversal of 21243234142033 is 33024143234212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15067074746689 + 6176159395344 = 3881633^2 + 2485188^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21243234142033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21243234142033.

It is not a weakly prime, because it can be changed into another prime (21243234148033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621617071016 + 10621617071017.

It is an arithmetic number, because the mean of its divisors is an integer number (10621617071017).

Almost surely, 2^{21243234142033} is an apocalyptic number.

It is an amenable number.

21243234142033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21243234142033 is an equidigital number, since it uses as much as digits as its factorization.

21243234142033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 34.

Adding to 21243234142033 its reverse (33024143234212), we get a palindrome (54267377376245).

The spelling of 21243234142033 in words is "twenty-one trillion, two hundred forty-three billion, two hundred thirty-four million, one hundred forty-two thousand, thirty-three".