20102210120021 has 2 divisors, whose sum is σ = 20102210120022. Its totient is φ = 20102210120020.

The previous prime is 20102210119987. The next prime is 20102210120023. The reversal of 20102210120021 is 12002101220102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20062883263921 + 39326856100 = 4479161^2 + 198310^2 .

It is a cyclic number.

It is not a de Polignac number, because 20102210120021 - 2¹⁴ = 20102210103637 is a prime.

Together with 20102210120023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20102210119978 and 20102210120005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20102210120023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051105060010 + 10051105060011.

It is an arithmetic number, because the mean of its divisors is an integer number (10051105060011).

Almost surely, 2^{20102210120021} is an apocalyptic number.

It is an amenable number.

20102210120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20102210120021 is an equidigital number, since it uses as much as digits as its factorization.

20102210120021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20102210120021 its reverse (12002101220102), we get a palindrome (32104311340123).

The spelling of 20102210120021 in words is "twenty trillion, one hundred two billion, two hundred ten million, one hundred twenty thousand, twenty-one".