21433352273 has 2 divisors, whose sum is σ = 21433352274. Its totient is φ = 21433352272.

The previous prime is 21433352251. The next prime is 21433352329. The reversal of 21433352273 is 37225333412.

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., 19312105024 + 2121247249 = 138968^2 + 46057^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433352273 - 2⁶ = 21433352209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21433352203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716676136 + 10716676137.

It is an arithmetic number, because the mean of its divisors is an integer number (10716676137).

Almost surely, 2^21433352273 is an apocalyptic number.

It is an amenable number.

21433352273 is a deficient number, since it is larger than the sum of its proper divisors (1).

21433352273 is an equidigital number, since it uses as much as digits as its factorization.

21433352273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 35.

Adding to 21433352273 its reverse (37225333412), we get a palindrome (58658685685).

The spelling of 21433352273 in words is "twenty-one billion, four hundred thirty-three million, three hundred fifty-two thousand, two hundred seventy-three".