1021120210109 has 2 divisors, whose sum is σ = 1021120210110. Its totient is φ = 1021120210108.

The previous prime is 1021120210081. The next prime is 1021120210157. The reversal of 1021120210109 is 9010120211201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1011627605209 + 9492604900 = 1005797^2 + 97430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021120210109 - 2⁸ = 1021120209853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021120210009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510560105054 + 510560105055.

It is an arithmetic number, because the mean of its divisors is an integer number (510560105055).

Almost surely, 2^{1021120210109} is an apocalyptic number.

It is an amenable number.

1021120210109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021120210109 is an equidigital number, since it uses as much as digits as its factorization.

1021120210109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 1021120210109 in words is "one trillion, twenty-one billion, one hundred twenty million, two hundred ten thousand, one hundred nine".