402402131402321 has 2 divisors, whose sum is σ = 402402131402322. Its totient is φ = 402402131402320.

The previous prime is 402402131402213. The next prime is 402402131402407. The reversal of 402402131402321 is 123204131204204.

Together with previous prime (402402131402213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 388916263321600 + 13485868080721 = 19720960^2 + 3672311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402402131402321 is a prime.

It is not a weakly prime, because it can be changed into another prime (402402131402021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201201065701160 + 201201065701161.

It is an arithmetic number, because the mean of its divisors is an integer number (201201065701161).

Almost surely, 2^{402402131402321} is an apocalyptic number.

It is an amenable number.

402402131402321 is a deficient number, since it is larger than the sum of its proper divisors (1).

402402131402321 is an equidigital number, since it uses as much as digits as its factorization.

402402131402321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 402402131402321 its reverse (123204131204204), we get a palindrome (525606262606525).

The spelling of 402402131402321 in words is "four hundred two trillion, four hundred two billion, one hundred thirty-one million, four hundred two thousand, three hundred twenty-one".