1268021 has 4 divisors (see below), whose sum is σ = 1270572. Its totient is φ = 1265472.

The previous prime is 1268017. The next prime is 1268039. The reversal of 1268021 is 1208621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1208621 = 79 ⋅15299.

It can be written as a sum of positive squares in 2 ways, for example, as 688900 + 579121 = 830^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1268021 - 2² = 1268017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1267984 and 1268002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260 + ... + 1613.

It is an arithmetic number, because the mean of its divisors is an integer number (317643).

2^1268021 is an apocalyptic number.

It is an amenable number.

1268021 is a deficient number, since it is larger than the sum of its proper divisors (2551).

1268021 is an equidigital number, since it uses as much as digits as its factorization.

1268021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2550.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1268021 is about 1126.0643853706. The cubic root of 1268021 is about 108.2369341010.

The spelling of 1268021 in words is "one million, two hundred sixty-eight thousand, twenty-one".