1123121211 has 8 divisors (see below), whose sum is σ = 1562603520. Its totient is φ = 716193192.

The previous prime is 1123121177. The next prime is 1123121221. The reversal of 1123121211 is 1121213211.

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

It is not a de Polignac number, because 1123121211 - 2⁶ = 1123121147 is a prime.

It is a super-2 number, since 2×1123121211² = 2522802509196213042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1123121221) 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, 8138491 + ... + 8138628.

It is an arithmetic number, because the mean of its divisors is an integer number (195325440).

Almost surely, 2^1123121211 is an apocalyptic number.

1123121211 is a deficient number, since it is larger than the sum of its proper divisors (439482309).

1123121211 is a wasteful number, since it uses less digits than its factorization.

1123121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16277145.

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

The square root of 1123121211 is about 33513.0006266225. Note that the first 3 decimals coincide. The cubic root of 1123121211 is about 1039.4626202450.

Adding to 1123121211 its reverse (1121213211), we get a palindrome (2244334422).

The spelling of 1123121211 in words is "one billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred eleven".