404242330021 has 2 divisors, whose sum is σ = 404242330022. Its totient is φ = 404242330020.

The previous prime is 404242329983. The next prime is 404242330049. The reversal of 404242330021 is 120033242404.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383625390625 + 20616939396 = 619375^2 + 143586^2 .

It is a cyclic number.

It is not a de Polignac number, because 404242330021 - 2⁷ = 404242329893 is a prime.

It is a super-2 number, since 2×404242330021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404242330721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202121165010 + 202121165011.

It is an arithmetic number, because the mean of its divisors is an integer number (202121165011).

Almost surely, 2^404242330021 is an apocalyptic number.

It is an amenable number.

404242330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

404242330021 is an equidigital number, since it uses as much as digits as its factorization.

404242330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 404242330021 its reverse (120033242404), we get a palindrome (524275572425).

The spelling of 404242330021 in words is "four hundred four billion, two hundred forty-two million, three hundred thirty thousand, twenty-one".