21352343565373 has 2 divisors, whose sum is σ = 21352343565374. Its totient is φ = 21352343565372.

The previous prime is 21352343565271. The next prime is 21352343565403. The reversal of 21352343565373 is 37356534325312.

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., 18098872792729 + 3253470772644 = 4254277^2 + 1803738^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21352343565373 is a prime.

It is a super-3 number, since 3×21352343565373³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21352343565373.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21352343565473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10676171782686 + 10676171782687.

It is an arithmetic number, because the mean of its divisors is an integer number (10676171782687).

Almost surely, 2^{21352343565373} is an apocalyptic number.

It is an amenable number.

21352343565373 is a deficient number, since it is larger than the sum of its proper divisors (1).

21352343565373 is an equidigital number, since it uses as much as digits as its factorization.

21352343565373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412000, while the sum is 52.

The spelling of 21352343565373 in words is "twenty-one trillion, three hundred fifty-two billion, three hundred forty-three million, five hundred sixty-five thousand, three hundred seventy-three".