21202011002069 has 2 divisors, whose sum is σ = 21202011002070. Its totient is φ = 21202011002068.

The previous prime is 21202011002009. The next prime is 21202011002077. The reversal of 21202011002069 is 96020011020212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15918623734225 + 5283387267844 = 3989815^2 + 2298562^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202011002069 - 2²⁰ = 21202009953493 is a prime.

It is a super-2 number, since 2×21202011002069² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21202011002009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601005501034 + 10601005501035.

It is an arithmetic number, because the mean of its divisors is an integer number (10601005501035).

Almost surely, 2^{21202011002069} is an apocalyptic number.

It is an amenable number.

21202011002069 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202011002069 is an equidigital number, since it uses as much as digits as its factorization.

21202011002069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21202011002069 in words is "twenty-one trillion, two hundred two billion, eleven million, two thousand, sixty-nine".