2821001 has 2 divisors, whose sum is σ = 2821002. Its totient is φ = 2821000.

The previous prime is 2820977. The next prime is 2821009. The reversal of 2821001 is 1001282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2805625 + 15376 = 1675^2 + 124^2 .

It is a cyclic number.

It is not a de Polignac number, because 2821001 - 2¹⁴ = 2804617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2821009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410500 + 1410501.

It is an arithmetic number, because the mean of its divisors is an integer number (1410501).

2^2821001 is an apocalyptic number.

It is an amenable number.

2821001 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821001 is an equidigital number, since it uses as much as digits as its factorization.

2821001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2821001 is about 1679.5835793434. The cubic root of 2821001 is about 141.2974790137.

Adding to 2821001 its reverse (1001282), we get a palindrome (3822283).

It can be divided in two parts, 282 and 1001, that multiplied together give a palindrome (282282).

The spelling of 2821001 in words is "two million, eight hundred twenty-one thousand, one".