21120223323209 has 2 divisors, whose sum is σ = 21120223323210. Its totient is φ = 21120223323208.

The previous prime is 21120223323163. The next prime is 21120223323253. The reversal of 21120223323209 is 90232332202112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16566096601609 + 4554126721600 = 4070147^2 + 2134040^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120223323209 - 2²⁰ = 21120222274633 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120223023209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560111661604 + 10560111661605.

It is an arithmetic number, because the mean of its divisors is an integer number (10560111661605).

Almost surely, 2^{21120223323209} is an apocalyptic number.

It is an amenable number.

21120223323209 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120223323209 is an equidigital number, since it uses as much as digits as its factorization.

21120223323209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The spelling of 21120223323209 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-three million, three hundred twenty-three thousand, two hundred nine".