2002021001 has 2 divisors, whose sum is σ = 2002021002. Its totient is φ = 2002021000.

The previous prime is 2002020989. The next prime is 2002021019. The reversal of 2002021001 is 1001202002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1998179401 + 3841600 = 44701^2 + 1960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2002021001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2002021001.

It is not a weakly prime, because it can be changed into another prime (2002026001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001010500 + 1001010501.

It is an arithmetic number, because the mean of its divisors is an integer number (1001010501).

Almost surely, 2^2002021001 is an apocalyptic number.

It is an amenable number.

2002021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002021001 is an equidigital number, since it uses as much as digits as its factorization.

2002021001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 2002021001 is about 44743.9493227855. The cubic root of 2002021001 is about 1260.3452906454.

Adding to 2002021001 its reverse (1001202002), we get a palindrome (3003223003).

The spelling of 2002021001 in words is "two billion, two million, twenty-one thousand, one".