1230404021 has 64 divisors (see below), whose sum is σ = 1664188416. Its totient is φ = 881496000.

The previous prime is 1230404017. The next prime is 1230404027. The reversal of 1230404021 is 1204040321.

It is not a de Polignac number, because 1230404021 - 2² = 1230404017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230404027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8148296 + ... + 8148446.

It is an arithmetic number, because the mean of its divisors is an integer number (26002944).

Almost surely, 2^1230404021 is an apocalyptic number.

1230404021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1230404021 is a deficient number, since it is larger than the sum of its proper divisors (433784395).

1230404021 is a wasteful number, since it uses less digits than its factorization.

1230404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1230404021 is about 35077.1153460486. The cubic root of 1230404021 is about 1071.5585697951.

Adding to 1230404021 its reverse (1204040321), we get a palindrome (2434444342).

The spelling of 1230404021 in words is "one billion, two hundred thirty million, four hundred four thousand, twenty-one".