4021001 has 2 divisors, whose sum is σ = 4021002. Its totient is φ = 4021000.

The previous prime is 4020977. The next prime is 4021009. The reversal of 4021001 is 1001204.

It is an a-pointer prime, because the next prime (4021009) can be obtained adding 4021001 to its sum of digits (8).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3701776 + 319225 = 1924^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021001 - 2¹⁴ = 4004617 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4021001.

It is not a weakly prime, because it can be changed into another prime (4021009) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010500 + 2010501.

It is an arithmetic number, because the mean of its divisors is an integer number (2010501).

Almost surely, 2^4021001 is an apocalyptic number.

It is an amenable number.

4021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021001 is an equidigital number, since it uses as much as digits as its factorization.

4021001 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 4021001 is about 2005.2433767501. The cubic root of 4021001 is about 159.0174288346.

Adding to 4021001 its reverse (1001204), we get a palindrome (5022205).

The spelling of 4021001 in words is "four million, twenty-one thousand, one".