21102220220069 has 2 divisors, whose sum is σ = 21102220220070. Its totient is φ = 21102220220068.

The previous prime is 21102220219981. The next prime is 21102220220071. The reversal of 21102220220069 is 96002202220112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15102356130625 + 5999864089444 = 3886175^2 + 2449462^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102220220069 is a prime.

It is a super-2 number, since 2×21102220220069² (a number of 27 digits) contains 22 as substring.

Together with 21102220220071, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102220220569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551110110034 + 10551110110035.

It is an arithmetic number, because the mean of its divisors is an integer number (10551110110035).

Almost surely, 2^{21102220220069} is an apocalyptic number.

It is an amenable number.

21102220220069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102220220069 is an equidigital number, since it uses as much as digits as its factorization.

21102220220069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 21102220220069 in words is "twenty-one trillion, one hundred two billion, two hundred twenty million, two hundred twenty thousand, sixty-nine".