1018021 has 2 divisors, whose sum is σ = 1018022. Its totient is φ = 1018020.

The previous prime is 1018019. The next prime is 1018057. The reversal of 1018021 is 1208101.

1018021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 756900 + 261121 = 870^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 1018021 - 2¹ = 1018019 is a prime.

Together with 1018019, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1017992 and 1018010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1018091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509010 + 509011.

It is an arithmetic number, because the mean of its divisors is an integer number (509011).

2^1018021 is an apocalyptic number.

It is an amenable number.

1018021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018021 is an equidigital number, since it uses as much as digits as its factorization.

1018021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1018021 is about 1008.9702671536. The cubic root of 1018021 is about 100.5971272929.

It can be divided in two parts, 10180 and 21, that added together give a palindrome (10201).

The spelling of 1018021 in words is "one million, eighteen thousand, twenty-one".