1123212111 has 16 divisors (see below), whose sum is σ = 1713273600. Its totient is φ = 641193408.

The previous prime is 1123212067. The next prime is 1123212127. The reversal of 1123212111 is 1112123211.

It is not a de Polignac number, because 1123212111 - 2⁶ = 1123212047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123212131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4846 + ... + 47643.

It is an arithmetic number, because the mean of its divisors is an integer number (107079600).

Almost surely, 2^1123212111 is an apocalyptic number.

1123212111 is a deficient number, since it is larger than the sum of its proper divisors (590061489).

1123212111 is a wasteful number, since it uses less digits than its factorization.

1123212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53518.

The product of its digits is 24, while the sum is 15.

The square root of 1123212111 is about 33514.3567892926. The cubic root of 1123212111 is about 1039.4906625145.

Adding to 1123212111 its reverse (1112123211), we get a palindrome (2235335322).

Subtracting from 1123212111 its reverse (1112123211), we obtain a square (11088900 = 3330²).

The spelling of 1123212111 in words is "one billion, one hundred twenty-three million, two hundred twelve thousand, one hundred eleven".