21747072223213 has 2 divisors, whose sum is σ = 21747072223214. Its totient is φ = 21747072223212.

The previous prime is 21747072223183. The next prime is 21747072223273. The reversal of 21747072223213 is 31232227074712.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17058989844009 + 4688082379204 = 4130253^2 + 2165198^2 .

It is a cyclic number.

It is not a de Polignac number, because 21747072223213 - 2²⁹ = 21746535352301 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21747072223213.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21747072223273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10873536111606 + 10873536111607.

It is an arithmetic number, because the mean of its divisors is an integer number (10873536111607).

Almost surely, 2^{21747072223213} is an apocalyptic number.

It is an amenable number.

21747072223213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21747072223213 is an equidigital number, since it uses as much as digits as its factorization.

21747072223213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 43.

Adding to 21747072223213 its reverse (31232227074712), we get a palindrome (52979299297925).

The spelling of 21747072223213 in words is "twenty-one trillion, seven hundred forty-seven billion, seventy-two million, two hundred twenty-three thousand, two hundred thirteen".