1330021 has 16 divisors (see below), whose sum is σ = 1732608. Its totient is φ = 990000.

The previous prime is 1330009. The next prime is 1330031. The reversal of 1330021 is 1200331.

1330021 = T₆₄ + T₆₅ + ... + T₂₀₁.

It is not a de Polignac number, because 1330021 - 2⁹ = 1329509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1330001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1396 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (108288).

2^1330021 is an apocalyptic number.

1330021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1330021 is a deficient number, since it is larger than the sum of its proper divisors (402587).

1330021 is a wasteful number, since it uses less digits than its factorization.

1330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 1330021 is about 1153.2653640858. The cubic root of 1330021 is about 109.9730236879.

Adding to 1330021 its reverse (1200331), we get a palindrome (2530352).

The spelling of 1330021 in words is "one million, three hundred thirty thousand, twenty-one".