1204423121 has 4 divisors (see below), whose sum is σ = 1313916144. Its totient is φ = 1094930100.

The previous prime is 1204423117. The next prime is 1204423127. The reversal of 1204423121 is 1213244021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1204423121 - 2² = 1204423117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1204423093 and 1204423102.

It is not an unprimeable number, because it can be changed into a prime (1204423127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54746495 + ... + 54746516.

It is an arithmetic number, because the mean of its divisors is an integer number (328479036).

Almost surely, 2^1204423121 is an apocalyptic number.

1204423121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1204423121 is a deficient number, since it is larger than the sum of its proper divisors (109493023).

1204423121 is a wasteful number, since it uses less digits than its factorization.

1204423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109493022.

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

The square root of 1204423121 is about 34704.7996824647. The cubic root of 1204423121 is about 1063.9625981468.

Adding to 1204423121 its reverse (1213244021), we get a palindrome (2417667142).

Subtracting 1204423121 from its reverse (1213244021), we obtain a square (8820900 = 2970²).

The spelling of 1204423121 in words is "one billion, two hundred four million, four hundred twenty-three thousand, one hundred twenty-one".