21152206334573 has 2 divisors, whose sum is σ = 21152206334574. Its totient is φ = 21152206334572.

The previous prime is 21152206334551. The next prime is 21152206334579. The reversal of 21152206334573 is 37543360225112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15651858675049 + 5500347659524 = 3956243^2 + 2345282^2 .

It is a cyclic number.

It is not a de Polignac number, because 21152206334573 - 2¹⁶ = 21152206269037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21152206334579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576103167286 + 10576103167287.

It is an arithmetic number, because the mean of its divisors is an integer number (10576103167287).

Almost surely, 2^{21152206334573} is an apocalyptic number.

It is an amenable number.

21152206334573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21152206334573 is an equidigital number, since it uses as much as digits as its factorization.

21152206334573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 44.

Adding to 21152206334573 its reverse (37543360225112), we get a palindrome (58695566559685).

The spelling of 21152206334573 in words is "twenty-one trillion, one hundred fifty-two billion, two hundred six million, three hundred thirty-four thousand, five hundred seventy-three".