11123212111 has 8 divisors (see below), whose sum is σ = 12141005184. Its totient is φ = 10106517720.

The previous prime is 11123212099. The next prime is 11123212127. The reversal of 11123212111 is 11121232111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11123212111 - 2¹⁵ = 11123179343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123212141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253425 + ... + 294058.

It is an arithmetic number, because the mean of its divisors is an integer number (1517625648).

Almost surely, 2^11123212111 is an apocalyptic number.

11123212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11123212111 is a deficient number, since it is larger than the sum of its proper divisors (1017793073).

11123212111 is a wasteful number, since it uses less digits than its factorization.

11123212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549341.

The product of its digits is 24, while the sum is 16.

Adding to 11123212111 its reverse (11121232111), we get a palindrome (22244444222).

The spelling of 11123212111 in words is "eleven billion, one hundred twenty-three million, two hundred twelve thousand, one hundred eleven".