21200200169 has 2 divisors, whose sum is σ = 21200200170. Its totient is φ = 21200200168.

The previous prime is 21200200139. The next prime is 21200200201. The reversal of 21200200169 is 96100200212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15169124569 + 6031075600 = 123163^2 + 77660^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200200169 - 2²⁰ = 21199151593 is a prime.

It is a super-2 number, since 2×21200200169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21200200139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600100084 + 10600100085.

It is an arithmetic number, because the mean of its divisors is an integer number (10600100085).

Almost surely, 2^21200200169 is an apocalyptic number.

It is an amenable number.

21200200169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200200169 is an equidigital number, since it uses as much as digits as its factorization.

21200200169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21200200169 in words is "twenty-one billion, two hundred million, two hundred thousand, one hundred sixty-nine".