1006021 has 2 divisors, whose sum is σ = 1006022. Its totient is φ = 1006020.

The previous prime is 1006007. The next prime is 1006037. The reversal of 1006021 is 1206001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 25921 = 990^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 1006021 - 2⁵ = 1005989 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1005989 and 1006007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1006091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 503010 + 503011.

It is an arithmetic number, because the mean of its divisors is an integer number (503011).

2^1006021 is an apocalyptic number.

It is an amenable number.

1006021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006021 is an equidigital number, since it uses as much as digits as its factorization.

1006021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1006021 is about 1003.0059820360. The cubic root of 1006021 is about 100.2002985371.

Subtracting from 1006021 its product of nonzero digits (12), we obtain a square (1006009 = 1003²).

The spelling of 1006021 in words is "one million, six thousand, twenty-one".