21313033032173 has 2 divisors, whose sum is σ = 21313033032174. Its totient is φ = 21313033032172.

The previous prime is 21313033032163. The next prime is 21313033032227. The reversal of 21313033032173 is 37123033031312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12949727636329 + 8363305395844 = 3598573^2 + 2891938^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313033032173 - 2⁴⁰ = 20213521404397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21313033032163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656516516086 + 10656516516087.

It is an arithmetic number, because the mean of its divisors is an integer number (10656516516087).

Almost surely, 2^{21313033032173} is an apocalyptic number.

It is an amenable number.

21313033032173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21313033032173 is an equidigital number, since it uses as much as digits as its factorization.

21313033032173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 32.

Adding to 21313033032173 its reverse (37123033031312), we get a palindrome (58436066063485).

The spelling of 21313033032173 in words is "twenty-one trillion, three hundred thirteen billion, thirty-three million, thirty-two thousand, one hundred seventy-three".