402443404313021 has 2 divisors, whose sum is σ = 402443404313022. Its totient is φ = 402443404313020.

The previous prime is 402443404313017. The next prime is 402443404313081. The reversal of 402443404313021 is 120313404344204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289488786496900 + 112954617816121 = 17014370^2 + 10628011^2 .

It is a cyclic number.

It is not a de Polignac number, because 402443404313021 - 2² = 402443404313017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402443404313081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201221702156510 + 201221702156511.

It is an arithmetic number, because the mean of its divisors is an integer number (201221702156511).

Almost surely, 2^{402443404313021} is an apocalyptic number.

It is an amenable number.

402443404313021 is a deficient number, since it is larger than the sum of its proper divisors (1).

402443404313021 is an equidigital number, since it uses as much as digits as its factorization.

402443404313021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 402443404313021 its reverse (120313404344204), we get a palindrome (522756808657225).

The spelling of 402443404313021 in words is "four hundred two trillion, four hundred forty-three billion, four hundred four million, three hundred thirteen thousand, twenty-one".