1020121011109 has 2 divisors, whose sum is σ = 1020121011110. Its totient is φ = 1020121011108.

The previous prime is 1020121011067. The next prime is 1020121011157. The reversal of 1020121011109 is 9011101210201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 580415422500 + 439705588609 = 761850^2 + 663103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020121011109 - 2¹⁹ = 1020120486821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020121011179) 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, 510060505554 + 510060505555.

It is an arithmetic number, because the mean of its divisors is an integer number (510060505555).

Almost surely, 2^{1020121011109} is an apocalyptic number.

It is an amenable number.

1020121011109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121011109 is an equidigital number, since it uses as much as digits as its factorization.

1020121011109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 1020121011109 in words is "one trillion, twenty billion, one hundred twenty-one million, eleven thousand, one hundred nine".