1122121111 has 2 divisors, whose sum is σ = 1122121112. Its totient is φ = 1122121110.

The previous prime is 1122121109. The next prime is 1122121129. The reversal of 1122121111 is 1111212211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1122121111 - 2¹ = 1122121109 is a prime.

Together with 1122121109, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1122121091 and 1122121100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1122121151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561060555 + 561060556.

It is an arithmetic number, because the mean of its divisors is an integer number (561060556).

Almost surely, 2^1122121111 is an apocalyptic number.

1122121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1122121111 is an equidigital number, since it uses as much as digits as its factorization.

1122121111 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1122121111 is about 33498.0762283448. The cubic root of 1122121111 is about 1039.1539936323.

Adding to 1122121111 its reverse (1111212211), we get a palindrome (2233333322).

The spelling of 1122121111 in words is "one billion, one hundred twenty-two million, one hundred twenty-one thousand, one hundred eleven".