21222102169 has 2 divisors, whose sum is σ = 21222102170. Its totient is φ = 21222102168.

The previous prime is 21222102149. The next prime is 21222102211. The reversal of 21222102169 is 96120122212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19772015769 + 1450086400 = 140613^2 + 38080^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222102169 - 2²¹ = 21220005017 is a prime.

It is a super-2 number, since 2×21222102169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21222102149) 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, 10611051084 + 10611051085.

It is an arithmetic number, because the mean of its divisors is an integer number (10611051085).

Almost surely, 2^21222102169 is an apocalyptic number.

It is an amenable number.

21222102169 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222102169 is an equidigital number, since it uses as much as digits as its factorization.

21222102169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21222102169 in words is "twenty-one billion, two hundred twenty-two million, one hundred two thousand, one hundred sixty-nine".