1000002020401 has 2 divisors, whose sum is σ = 1000002020402. Its totient is φ = 1000002020400.

The previous prime is 1000002020389. The next prime is 1000002020411. The reversal of 1000002020401 is 1040202000001.

It is an a-pointer prime, because the next prime (1000002020411) can be obtained adding 1000002020401 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 958284366400 + 41717654001 = 978920^2 + 204249^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000002020401 - 2⁹ = 1000002019889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000002020411) 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, 500001010200 + 500001010201.

It is an arithmetic number, because the mean of its divisors is an integer number (500001010201).

Almost surely, 2^{1000002020401} is an apocalyptic number.

It is an amenable number.

1000002020401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000002020401 is an equidigital number, since it uses as much as digits as its factorization.

1000002020401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 1000002020401 its reverse (1040202000001), we get a palindrome (2040204020402).

The spelling of 1000002020401 in words is "one trillion, two million, twenty thousand, four hundred one".