1021202002001 has 2 divisors, whose sum is σ = 1021202002002. Its totient is φ = 1021202002000.

The previous prime is 1021202001997. The next prime is 1021202002039. The reversal of 1021202002001 is 1002002021201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739469285776 + 281732716225 = 859924^2 + 530785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021202002001 - 2² = 1021202001997 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021202004001) 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, 510601001000 + 510601001001.

It is an arithmetic number, because the mean of its divisors is an integer number (510601001001).

Almost surely, 2^{1021202002001} is an apocalyptic number.

It is an amenable number.

1021202002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021202002001 is an equidigital number, since it uses as much as digits as its factorization.

1021202002001 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 11.

Adding to 1021202002001 its reverse (1002002021201), we get a palindrome (2023204023202).

The spelling of 1021202002001 in words is "one trillion, twenty-one billion, two hundred two million, two thousand, one".