21120221202169 has 2 divisors, whose sum is σ = 21120221202170. Its totient is φ = 21120221202168.

The previous prime is 21120221202161. The next prime is 21120221202181. The reversal of 21120221202169 is 96120212202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21049624712169 + 70596490000 = 4587987^2 + 265700^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120221202169 - 2³ = 21120221202161 is a prime.

It is a super-2 number, since 2×21120221202169² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21120221202169.

It is not a weakly prime, because it can be changed into another prime (21120221202161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560110601084 + 10560110601085.

It is an arithmetic number, because the mean of its divisors is an integer number (10560110601085).

Almost surely, 2^{21120221202169} is an apocalyptic number.

It is an amenable number.

21120221202169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120221202169 is an equidigital number, since it uses as much as digits as its factorization.

21120221202169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 21120221202169 in words is "twenty-one trillion, one hundred twenty billion, two hundred twenty-one million, two hundred two thousand, one hundred sixty-nine".