1243103121 has 48 divisors (see below), whose sum is σ = 2061521280. Its totient is φ = 715046400.

The previous prime is 1243103107. The next prime is 1243103123. The reversal of 1243103121 is 1213013421.

It is not a de Polignac number, because 1243103121 - 2²² = 1238908817 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1243103094 and 1243103103.

It is not an unprimeable number, because it can be changed into a prime (1243103123) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 298270 + ... + 302408.

It is an arithmetic number, because the mean of its divisors is an integer number (42948360).

Almost surely, 2^1243103121 is an apocalyptic number.

It is an amenable number.

1243103121 is a deficient number, since it is larger than the sum of its proper divisors (818418159).

1243103121 is a wasteful number, since it uses less digits than its factorization.

1243103121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326 (or 4323 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1243103121 is about 35257.6675490595. The cubic root of 1243103121 is about 1075.2325066944.

Adding to 1243103121 its reverse (1213013421), we get a palindrome (2456116542).

The spelling of 1243103121 in words is "one billion, two hundred forty-three million, one hundred three thousand, one hundred twenty-one".