1230404921 has 2 divisors, whose sum is σ = 1230404922. Its totient is φ = 1230404920.

The previous prime is 1230404909. The next prime is 1230404947. The reversal of 1230404921 is 1294040321.

It is an a-pointer prime, because the next prime (1230404947) can be obtained adding 1230404921 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 890186896 + 340218025 = 29836^2 + 18445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230404921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1230484921) 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 as a sum of consecutive naturals, namely, 615202460 + 615202461.

It is an arithmetic number, because the mean of its divisors is an integer number (615202461).

Almost surely, 2^1230404921 is an apocalyptic number.

It is an amenable number.

1230404921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230404921 is an equidigital number, since it uses as much as digits as its factorization.

1230404921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 1230404921 is about 35077.1281749233. The cubic root of 1230404921 is about 1071.5588310650.

The spelling of 1230404921 in words is "one billion, two hundred thirty million, four hundred four thousand, nine hundred twenty-one".