1211103123 has 8 divisors (see below), whose sum is σ = 1615118736. Its totient is φ = 807244800.

The previous prime is 1211103043. The next prime is 1211103139. The reversal of 1211103123 is 3213011121.

It is a happy number.

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

It is not a de Polignac number, because 1211103123 - 2¹⁴ = 1211086739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211103143) 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, 19998 + ... + 53123.

It is an arithmetic number, because the mean of its divisors is an integer number (201889842).

Almost surely, 2^1211103123 is an apocalyptic number.

1211103123 is a deficient number, since it is larger than the sum of its proper divisors (404015613).

1211103123 is an equidigital number, since it uses as much as digits as its factorization.

1211103123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78645.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1211103123 is about 34800.9069278374. The cubic root of 1211103123 is about 1065.9259649475.

Adding to 1211103123 its reverse (3213011121), we get a palindrome (4424114244).

The spelling of 1211103123 in words is "one billion, two hundred eleven million, one hundred three thousand, one hundred twenty-three".