21213313573 has 2 divisors, whose sum is σ = 21213313574. Its totient is φ = 21213313572.

The previous prime is 21213313549. The next prime is 21213313577. The reversal of 21213313573 is 37531331212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19053109089 + 2160204484 = 138033^2 + 46478^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21213313573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213313577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606656786 + 10606656787.

It is an arithmetic number, because the mean of its divisors is an integer number (10606656787).

Almost surely, 2^21213313573 is an apocalyptic number.

It is an amenable number.

21213313573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213313573 is an equidigital number, since it uses as much as digits as its factorization.

21213313573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 31.

Adding to 21213313573 its reverse (37531331212), we get a palindrome (58744644785).

The spelling of 21213313573 in words is "twenty-one billion, two hundred thirteen million, three hundred thirteen thousand, five hundred seventy-three".