1020221210209 has 2 divisors, whose sum is σ = 1020221210210. Its totient is φ = 1020221210208.

The previous prime is 1020221210207. The next prime is 1020221210213. The reversal of 1020221210209 is 9020121220201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1005166656400 + 15054553809 = 1002580^2 + 122697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020221210209 - 2¹ = 1020221210207 is a prime.

Together with 1020221210207, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1020221210209.

It is not a weakly prime, because it can be changed into another prime (1020221210207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110605104 + 510110605105.

It is an arithmetic number, because the mean of its divisors is an integer number (510110605105).

Almost surely, 2^{1020221210209} is an apocalyptic number.

It is an amenable number.

1020221210209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020221210209 is an equidigital number, since it uses as much as digits as its factorization.

1020221210209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 1020221210209 in words is "one trillion, twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred nine".