7018021 has 2 divisors, whose sum is σ = 7018022. Its totient is φ = 7018020.

The previous prime is 7018019. The next prime is 7018043. The reversal of 7018021 is 1208107.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6687396 + 330625 = 2586^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 7018021 - 2¹ = 7018019 is a prime.

Together with 7018019, it forms a pair of twin primes.

7018021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7018021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7018061) 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 as a sum of consecutive naturals, namely, 3509010 + 3509011.

It is an arithmetic number, because the mean of its divisors is an integer number (3509011).

Almost surely, 2^7018021 is an apocalyptic number.

It is an amenable number.

7018021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7018021 is an equidigital number, since it uses as much as digits as its factorization.

7018021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 7018021 is about 2649.1547708656. The cubic root of 7018021 is about 191.4571344314.

The spelling of 7018021 in words is "seven million, eighteen thousand, twenty-one".