1016021 has 4 divisors (see below), whose sum is σ = 1040844. Its totient is φ = 991200.

The previous prime is 1016011. The next prime is 1016023. The reversal of 1016021 is 1206101.

1016021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180625 + 835396 = 425^2 + 914^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1016021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1015993 and 1016011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12350 + ... + 12431.

It is an arithmetic number, because the mean of its divisors is an integer number (260211).

2^1016021 is an apocalyptic number.

It is an amenable number.

1016021 is a deficient number, since it is larger than the sum of its proper divisors (24823).

1016021 is an equidigital number, since it uses as much as digits as its factorization.

1016021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24822.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1016021 is about 1007.9786704093. The cubic root of 1016021 is about 100.5312065330.

The spelling of 1016021 in words is "one million, sixteen thousand, twenty-one".