1020121111 has 2 divisors, whose sum is σ = 1020121112. Its totient is φ = 1020121110.

The previous prime is 1020121099. The next prime is 1020121133. The reversal of 1020121111 is 1111210201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1020121111 - 2⁵ = 1020121079 is a prime.

It is a super-2 number, since 2×1020121111² = 2081294162215748642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020121181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510060555 + 510060556.

It is an arithmetic number, because the mean of its divisors is an integer number (510060556).

Almost surely, 2^1020121111 is an apocalyptic number.

1020121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020121111 is an equidigital number, since it uses as much as digits as its factorization.

1020121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1020121111 is about 31939.3348553159. The cubic root of 1020121111 is about 1006.6625488602.

Adding to 1020121111 its reverse (1111210201), we get a palindrome (2131331312).

The spelling of 1020121111 in words is "one billion, twenty million, one hundred twenty-one thousand, one hundred eleven".