402442323221 has 2 divisors, whose sum is σ = 402442323222. Its totient is φ = 402442323220.

The previous prime is 402442323209. The next prime is 402442323253. The reversal of 402442323221 is 122323244204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 395497600996 + 6944722225 = 628886^2 + 83335^2 .

It is a cyclic number.

It is not a de Polignac number, because 402442323221 - 2¹⁴ = 402442306837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402442323421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201221161610 + 201221161611.

It is an arithmetic number, because the mean of its divisors is an integer number (201221161611).

Almost surely, 2^402442323221 is an apocalyptic number.

It is an amenable number.

402442323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

402442323221 is an equidigital number, since it uses as much as digits as its factorization.

402442323221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 402442323221 its reverse (122323244204), we get a palindrome (524765567425).

The spelling of 402442323221 in words is "four hundred two billion, four hundred forty-two million, three hundred twenty-three thousand, two hundred twenty-one".