1243121204 has 48 divisors (see below), whose sum is σ = 2523601920. Its totient is φ = 531083520.

The previous prime is 1243121203. The next prime is 1243121207. The reversal of 1243121204 is 4021213421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20312 + ... + 53840.

It is an arithmetic number, because the mean of its divisors is an integer number (52575040).

Almost surely, 2^1243121204 is an apocalyptic number.

It is an amenable number.

1243121204 is an abundant number, since it is smaller than the sum of its proper divisors (1280480716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243121204 is a wasteful number, since it uses less digits than its factorization.

1243121204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33600 (or 33598 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1243121204 is about 35257.9239888000. The cubic root of 1243121204 is about 1075.2377203501.

Adding to 1243121204 its reverse (4021213421), we get a palindrome (5264334625).

The spelling of 1243121204 in words is "one billion, two hundred forty-three million, one hundred twenty-one thousand, two hundred four".