21183131608073 has 2 divisors, whose sum is σ = 21183131608074. Its totient is φ = 21183131608072.

The previous prime is 21183131608061. The next prime is 21183131608087. The reversal of 21183131608073 is 37080613138112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16415559798544 + 4767571809529 = 4051612^2 + 2183477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21183131608073 - 2²⁰ = 21183130559497 is a prime.

It is not a weakly prime, because it can be changed into another prime (21183131638073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10591565804036 + 10591565804037.

It is an arithmetic number, because the mean of its divisors is an integer number (10591565804037).

Almost surely, 2^{21183131608073} is an apocalyptic number.

It is an amenable number.

21183131608073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21183131608073 is an equidigital number, since it uses as much as digits as its factorization.

21183131608073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 21183131608073 in words is "twenty-one trillion, one hundred eighty-three billion, one hundred thirty-one million, six hundred eight thousand, seventy-three".