402403402321 has 2 divisors, whose sum is σ = 402403402322. Its totient is φ = 402403402320.

The previous prime is 402403402259. The next prime is 402403402363. The reversal of 402403402321 is 123204304204.

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., 316591902225 + 85811500096 = 562665^2 + 292936^2 .

It is a cyclic number.

It is not a de Polignac number, because 402403402321 - 2²¹ = 402401305169 is a prime.

It is not a weakly prime, because it can be changed into another prime (402403402391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201201701160 + 201201701161.

It is an arithmetic number, because the mean of its divisors is an integer number (201201701161).

Almost surely, 2^402403402321 is an apocalyptic number.

It is an amenable number.

402403402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

402403402321 is an equidigital number, since it uses as much as digits as its factorization.

402403402321 is an evil number, because the sum of its binary digits is even.

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

Adding to 402403402321 its reverse (123204304204), we get a palindrome (525607706525).

The spelling of 402403402321 in words is "four hundred two billion, four hundred three million, four hundred two thousand, three hundred twenty-one".