1020121210111 has 2 divisors, whose sum is σ = 1020121210112. Its totient is φ = 1020121210110.

The previous prime is 1020121210103. The next prime is 1020121210151. The reversal of 1020121210111 is 1110121210201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020121210111 - 2³ = 1020121210103 is a prime.

It is the 1010011-st Hogben number.

It is a junction number, because it is equal to n+sod(n) for n = 1020121210091 and 1020121210100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020121210151) by changing a digit.

It is a nontrivial repunit in base 1010010.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060605055 + 510060605056.

It is an arithmetic number, because the mean of its divisors is an integer number (510060605056).

Almost surely, 2^{1020121210111} is an apocalyptic number.

1020121210111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121210111 is an equidigital number, since it uses as much as digits as its factorization.

1020121210111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1020121210111 its reverse (1110121210201), we get a palindrome (2130242420312).

The spelling of 1020121210111 in words is "one trillion, twenty billion, one hundred twenty-one million, two hundred ten thousand, one hundred eleven".